Yes, that's it. I tried it with your stats and got just under 29. You went wrong somewhere.
(215/2.2)/(72/39)^2=(97.73)/(1.85)^2=(97.73)/(3.42)=28.57
Whoops - about 29. I forgot to square the denominator. LOL. That will teach me to get a degree in math. LOLOLOL
It is STILL junk. I am in no way obese.