Fascinating topic! I teach English to speakers of other languages and am always interested in hearing about people's language learning experiences. I, too, am very impressed with the level of proficiency of the non-native Egnoish speakers on this forum.
I didn't respond to the poll itself because I wonder how "fluent" is defined. That's the professional language teacher in me. I will say that I can communicate in Mandarin Chinese, French, Swedish, and Krio to the effect of having a social conversation in those languages. I can barely read and write Chinese and it's the hardest language I've ever studied but it's the one I currently want to become more proficient in; I spent three and a half years in China teaching and am hoping to eventually go back to study the language. French was my first foreign language and I took that in school for several years, then studied it in Quebec for a summer. Swedish I was fluent in as a result of spending a year in high school there, but that was oh...xxx number of years ago. Krio I learned as a Peace Corps Volunteer in West Africa; as a creole language, I found it very easy to learn.
While in Sweden, I could understand a fair amount of Danish and Norwegian, and even a little German. I studied Italian for a year in high school in the US and was always getting it confused with French. I studied Russian in college for the equivalent of two years but now only remember a few words and phrases. I had to go to Hebrew school as a kid and what little I learned, I've pretty much forgotten. I tried to teach myself Old Icelandic my first year in college but gave up for lack of time. I learned enough Bahasa Indonesia from working in Borneo for a year to communicate socially but I've forgotten it now. I've learned some Spanish because most of my students are native Spanish speakers and it helps when I need to communicate with their parents (I teach children nowadays).
I would love to learn Ladino as well as Hungarian. My grandmother emigrated to the US from Austria-Hungary and taught me to count to ten in Hungarian and to say "yes" and "no." I can count to three in Finnish and to ten in Japanese! I know a few other words in Japanese because my family hosted an exchange student from that country for a year.
I love languages!
(And if you made it this far, I'm guessing you do, too!)