By the time I read the comment from knitted gems, I'd already finished off the dishcloth. In retrospect, Marie, you are totally right. I could've just bound off the last triangle and let it wobble. But here's what I ended up doing:
I guess it worked out okay in the end.
esoteric knitter, don't be intimidated by entrelac! It's really not bad at all. If you can do short rows, you can do this too! To everyone out there that's not sure about entrelac, I highly, highly recommend that dishcloth pattern. It's very low pressure - any mistakes get hidden really easily, it's a small item, and even if you wind up with holes in it, it'll still serve as a perfectly good dishcloth! If you give it a try, let me know how it goes!