Finding the Fourth Proportional to 31,138.62, 42,972.24 and 17,711.81

Step by Step Solution

1. Step 1: Write the proportion equation
   31,138.62 : 42,972.24 = 17,711.81 : x
2. Step 2: Convert to fraction form
   31,138.62/42,972.24 = 17,711.81/x
3. Step 3: Cross multiply
   31,138.62x = 42,972.24 × 17,711.81
4. Step 4: Simplify right side
   31,138.62x = 761,116,150.15
5. Step 5: Solve for x
   x = 761,116,150.15/31,138.62
6. Step 6: Final answer
   x = 24,442.83