Finding the Fourth Proportional to 22,940.39, 31,661.27 and 12,872.90

Step by Step Solution

1. Step 1: Write the proportion equation
   22,940.39 : 31,661.27 = 12,872.90 : x
2. Step 2: Convert to fraction form
   22,940.39/31,661.27 = 12,872.90/x
3. Step 3: Cross multiply
   22,940.39x = 31,661.27 × 12,872.90
4. Step 4: Simplify right side
   22,940.39x = 407,572,139.91
5. Step 5: Solve for x
   x = 407,572,139.91/22,940.39
6. Step 6: Final answer
   x = 17,766.58