Finding the Fourth Proportional to 22,711.69, 31,341.31 and 12,640.55

Step by Step Solution

1. Step 1: Write the proportion equation
   22,711.69 : 31,341.31 = 12,640.55 : x
2. Step 2: Convert to fraction form
   22,711.69/31,341.31 = 12,640.55/x
3. Step 3: Cross multiply
   22,711.69x = 31,341.31 × 12,640.55
4. Step 4: Simplify right side
   22,711.69x = 396,171,396.12
5. Step 5: Solve for x
   x = 396,171,396.12/22,711.69
6. Step 6: Final answer
   x = 17,443.51