Finding the Fourth Proportional to 22,615.57, 31,209.60 and 12,543.31

Step by Step Solution

1. Step 1: Write the proportion equation
   22,615.57 : 31,209.60 = 12,543.31 : x
2. Step 2: Convert to fraction form
   22,615.57/31,209.60 = 12,543.31/x
3. Step 3: Cross multiply
   22,615.57x = 31,209.60 × 12,543.31
4. Step 4: Simplify right side
   22,615.57x = 391,471,687.78
5. Step 5: Solve for x
   x = 391,471,687.78/22,615.57
6. Step 6: Final answer
   x = 17,309.83