Let X be the first even integer.
then X + 2 is the next even integer (for example if x = 6, the next even integer would 6 +2 = 8)
and X + 4 the next even integer
Now since product means multiplication, (x)(x +2)(x+4) = x^3 + 6x^2 + 8x.
If a total is given you set the function above to the total and solve for x.