Finding the Fourth Proportional to 9,342.72, 12,892.32 and 5,150.40

Step by Step Solution

1. Step 1: Write the proportion equation
   9,342.72 : 12,892.32 = 5,150.40 : x
2. Step 2: Convert to fraction form
   9,342.72/12,892.32 = 5,150.40/x
3. Step 3: Cross multiply
   9,342.72x = 12,892.32 × 5,150.40
4. Step 4: Simplify right side
   9,342.72x = 66,400,604.93
5. Step 5: Solve for x
   x = 66,400,604.93/9,342.72
6. Step 6: Final answer
   x = 7,107.20