Finding the Fourth Proportional to 9,108.30, 12,569.50 and 5,129.48

Step by Step Solution

1. Step 1: Write the proportion equation
   9,108.30 : 12,569.50 = 5,129.48 : x
2. Step 2: Convert to fraction form
   9,108.30/12,569.50 = 5,129.48/x
3. Step 3: Cross multiply
   9,108.30x = 12,569.50 × 5,129.48
4. Step 4: Simplify right side
   9,108.30x = 64,474,998.86
5. Step 5: Solve for x
   x = 64,474,998.86/9,108.30
6. Step 6: Final answer
   x = 7,078.71