Finding the Fourth Proportional to 22,807.28, 31,470.10 and 12,735.20

Step by Step Solution

1. Step 1: Write the proportion equation
   22,807.28 : 31,470.10 = 12,735.20 : x
2. Step 2: Convert to fraction form
   22,807.28/31,470.10 = 12,735.20/x
3. Step 3: Cross multiply
   22,807.28x = 31,470.10 × 12,735.20
4. Step 4: Simplify right side
   22,807.28x = 400,778,017.52
5. Step 5: Solve for x
   x = 400,778,017.52/22,807.28
6. Step 6: Final answer
   x = 17,572.37