Finding the Fourth Proportional to 8,715.04, 13,072.32 and 3,520.72

Step by Step Solution

1. Step 1: Write the proportion equation
   8,715.04 : 13,072.32 = 3,520.72 : x
2. Step 2: Convert to fraction form
   8,715.04/13,072.32 = 3,520.72/x
3. Step 3: Cross multiply
   8,715.04x = 13,072.32 × 3,520.72
4. Step 4: Simplify right side
   8,715.04x = 46,023,978.47
5. Step 5: Solve for x
   x = 46,023,978.47/8,715.04
6. Step 6: Final answer
   x = 5,280.98