I am a bit puzzled as to why you would want a "non-algebraic" way when algebra works so nicely. However, you could try this- since "three consecutive numbers" are about as close togetheras three integers can be, they must each be approximately 1716/3= 572. Try three consecutive numbers around that.
I am wondering why you titled this "real numbers" when, to be able to talk about "consecutive" they must be integer.
and, of course, this has nothing to do with "Statistics and Probability".