Finding the Fourth Proportional to 22,785.50, 31,445.20 and 13,357.10

Step by Step Solution

1. Step 1: Write the proportion equation
   22,785.50 : 31,445.20 = 13,357.10 : x
2. Step 2: Convert to fraction form
   22,785.50/31,445.20 = 13,357.10/x
3. Step 3: Cross multiply
   22,785.50x = 31,445.20 × 13,357.10
4. Step 4: Simplify right side
   22,785.50x = 420,016,680.92
5. Step 5: Solve for x
   x = 420,016,680.92/22,785.50
6. Step 6: Final answer
   x = 18,433.51