Finding the Fourth Proportional to 31,562.69, 43,557.80 and 18,138.15

Step by Step Solution

1. Step 1: Write the proportion equation
   31,562.69 : 43,557.80 = 18,138.15 : x
2. Step 2: Convert to fraction form
   31,562.69/43,557.80 = 18,138.15/x
3. Step 3: Cross multiply
   31,562.69x = 43,557.80 × 18,138.15
4. Step 4: Simplify right side
   31,562.69x = 790,057,819.38
5. Step 5: Solve for x
   x = 790,057,819.38/31,562.69
6. Step 6: Final answer
   x = 25,031.39