Finding the Fourth Proportional to 9,129.71, 12,599.15 and 5,150.89

Step by Step Solution

1. Step 1: Write the proportion equation
   9,129.71 : 12,599.15 = 5,150.89 : x
2. Step 2: Convert to fraction form
   9,129.71/12,599.15 = 5,150.89/x
3. Step 3: Cross multiply
   9,129.71x = 12,599.15 × 5,150.89
4. Step 4: Simplify right side
   9,129.71x = 64,896,825.74
5. Step 5: Solve for x
   x = 64,896,825.74/9,129.71
6. Step 6: Final answer
   x = 7,108.31