Finding the Fourth Proportional to 9,369.57, 12,929.99 and 5,391.47

Step by Step Solution

1. Step 1: Write the proportion equation
   9,369.57 : 12,929.99 = 5,391.47 : x
2. Step 2: Convert to fraction form
   9,369.57/12,929.99 = 5,391.47/x
3. Step 3: Cross multiply
   9,369.57x = 12,929.99 × 5,391.47
4. Step 4: Simplify right side
   9,369.57x = 69,711,561.58
5. Step 5: Solve for x
   x = 69,711,561.58/9,369.57
6. Step 6: Final answer
   x = 7,440.21