Finding the Fourth Proportional to 22,557.50, 31,132.56 and 13,129.10

Step by Step Solution

1. Step 1: Write the proportion equation
   22,557.50 : 31,132.56 = 13,129.10 : x
2. Step 2: Convert to fraction form
   22,557.50/31,132.56 = 13,129.10/x
3. Step 3: Cross multiply
   22,557.50x = 31,132.56 × 13,129.10
4. Step 4: Simplify right side
   22,557.50x = 408,742,493.50
5. Step 5: Solve for x
   x = 408,742,493.50/22,557.50
6. Step 6: Final answer
   x = 18,120.03