There are 784 gallons in 100 cubic feet of water. how many gallons of water are in this reservoir if it is 56% full? this question needs 4 steps to solve it plz with steps

We know that

step 1
find the volume of reservoir
[volume of reservoir]=15*20*10> 3000 ft³

step 2
find the volume of water in the reservoir
if it is 56% full
then
volume of water is> .56*3000> 1680 ft³

step 3
convert ft³ to gal
if 784 gal> 100 ft³
 X> 1680 ft³
X=1680*784/100> X=13.171.2 gal

the answer is
13171.2 gal