Finding the Fourth Proportional to 31,425.90, 43,355.37 and 17,989.91

Step by Step Solution

1. Step 1: Write the proportion equation
   31,425.90 : 43,355.37 = 17,989.91 : x
2. Step 2: Convert to fraction form
   31,425.90/43,355.37 = 17,989.91/x
3. Step 3: Cross multiply
   31,425.90x = 43,355.37 × 17,989.91
4. Step 4: Simplify right side
   31,425.90x = 779,959,204.32
5. Step 5: Solve for x
   x = 779,959,204.32/31,425.90
6. Step 6: Final answer
   x = 24,818.99