Your proportion should look something like this

After cross multiplication, you should end up with this equation

After dividing 4 on both sides, you should get that x=9
Answer:
if boo ygdv
Step-by-step explanation:
f bi igfcnkyf f jurf
<em>Hope</em><em> </em><em>this</em><em> </em><em>will</em><em> </em><em>help</em><em> </em><em>u</em><em>.</em><em>.</em><em>.</em>
Add up all 3 colors first
5 + 4 + 3 = 12
5 blue balls
5 over 12