Finding the Fourth Proportional to 8,718.72, 12,025.68 and 5,359.20

Step by Step Solution

1. Step 1: Write the proportion equation
   8,718.72 : 12,025.68 = 5,359.20 : x
2. Step 2: Convert to fraction form
   8,718.72/12,025.68 = 5,359.20/x
3. Step 3: Cross multiply
   8,718.72x = 12,025.68 × 5,359.20
4. Step 4: Simplify right side
   8,718.72x = 64,448,024.26
5. Step 5: Solve for x
   x = 64,448,024.26/8,718.72
6. Step 6: Final answer
   x = 7,391.91