Can I get some help on this problem? Thanks guys yo its really easy but I cant figure it out

Answer:
x is equal to 15.
Step-by-step explanation:
In order to solve this, we need to set it up as a proportion.
6/8 = x/20
Now that we have the proportion, we need to cross multiply to solve.
6*20 = 8*x
120 = 8x
15 = x