the larger two numbers are four times the smaller and their sum is 85

Let x be the smallest number, and let y and z be the larger numbers....therefore, we have..

(y + z) = 4x

And

x + (y + z) = 85       substitute for (y + z)

x +  4x   = 85

5x  = 85       divide by 5 on both sides

x = 17

And (y + z) = 4(17) = 68

Unfortunately, we cannot determine the exact values for y and z....there are infinite possibilities.....!!!