Finding the Fourth Proportional to 31,561.92, 43,553.97 and 18,123.71

Step by Step Solution

1. Step 1: Write the proportion equation
   31,561.92 : 43,553.97 = 18,123.71 : x
2. Step 2: Convert to fraction form
   31,561.92/43,553.97 = 18,123.71/x
3. Step 3: Cross multiply
   31,561.92x = 43,553.97 × 18,123.71
4. Step 4: Simplify right side
   31,561.92x = 789,359,303.86
5. Step 5: Solve for x
   x = 789,359,303.86/31,561.92
6. Step 6: Final answer
   x = 25,009.86