The first number was increased by four. The second number was decreased by four. The third number was multiplied by four. The fourth number was divided by four.

The given is not really clear!

What I understood..
(a+4) + (b-4) + (c*4) + (d/4) = 60
a+b+4*c+0.25*d = 60
then you have many solutions for a, b, c, and d.
one can be:
a = 10
b= 12
c = 4
and d = 88.