Finding the Fourth Proportional to 9,108.72, 12,567.52 and 5,129.60

Step by Step Solution

1. Step 1: Write the proportion equation
   9,108.72 : 12,567.52 = 5,129.60 : x
2. Step 2: Convert to fraction form
   9,108.72/12,567.52 = 5,129.60/x
3. Step 3: Cross multiply
   9,108.72x = 12,567.52 × 5,129.60
4. Step 4: Simplify right side
   9,108.72x = 64,466,350.59
5. Step 5: Solve for x
   x = 64,466,350.59/9,108.72
6. Step 6: Final answer
   x = 7,077.43