You can
put this solution on YOUR website!x*(x+1)*(x+2) = 504

It's likely to be integers, so look for integer roots.
504 = 2*2*2*3*3*7 so it's likely a root will be 7 or a multiple of 7. Plus, the dimensions are 3 sequential numbers.
504 = 7*8*9, so that's the answer.