Finding the Fourth Proportional to 23,131.80, 31,920.10 and 13,061.24

Step by Step Solution

1. Step 1: Write the proportion equation
   23,131.80 : 31,920.10 = 13,061.24 : x
2. Step 2: Convert to fraction form
   23,131.80/31,920.10 = 13,061.24/x
3. Step 3: Cross multiply
   23,131.80x = 31,920.10 × 13,061.24
4. Step 4: Simplify right side
   23,131.80x = 416,916,086.92
5. Step 5: Solve for x
   x = 416,916,086.92/23,131.80
6. Step 6: Final answer
   x = 18,023.50