Finding the Fourth Proportional to 9,429.43, 12,912.02 and 9,057.64

Step by Step Solution

1. Step 1: Write the proportion equation
   9,429.43 : 12,912.02 = 9,057.64 : x
2. Step 2: Convert to fraction form
   9,429.43/12,912.02 = 9,057.64/x
3. Step 3: Cross multiply
   9,429.43x = 12,912.02 × 9,057.64
4. Step 4: Simplify right side
   9,429.43x = 116,952,428.83
5. Step 5: Solve for x
   x = 116,952,428.83/9,429.43
6. Step 6: Final answer
   x = 12,402.92