What is missing for the following quantity to be true? 3a . 4y . 5=5 . 3a 3a 4y 5 15

We have the following expression:
 3a. 4y. 5
 Using commutative property we have:
 5 . 3a. 4y
 Therefore we have that the corresponding equality is:
 3a. 4y. 5 = 5 3a. 4y
 We now observe the expression given in the problem:
 3a. 4y. 5 = 5 3a
 Comparing with the obtained expression, it is observed that the missing term is:
 4y
 
 The missing for the quantity to be true is:
 4y