Finding the Fourth Proportional to 9,164.16, 12,642.72 and 5,621.28

Step by Step Solution

1. Step 1: Write the proportion equation
   9,164.16 : 12,642.72 = 5,621.28 : x
2. Step 2: Convert to fraction form
   9,164.16/12,642.72 = 5,621.28/x
3. Step 3: Cross multiply
   9,164.16x = 12,642.72 × 5,621.28
4. Step 4: Simplify right side
   9,164.16x = 71,068,269.08
5. Step 5: Solve for x
   x = 71,068,269.08/9,164.16
6. Step 6: Final answer
   x = 7,755.02