Finding the Fourth Proportional to 31,120.70, 42,946.37 and 17,691.96

Step by Step Solution

1. Step 1: Write the proportion equation
   31,120.70 : 42,946.37 = 17,691.96 : x
2. Step 2: Convert to fraction form
   31,120.70/42,946.37 = 17,691.96/x
3. Step 3: Cross multiply
   31,120.70x = 42,946.37 × 17,691.96
4. Step 4: Simplify right side
   31,120.70x = 759,805,504.42
5. Step 5: Solve for x
   x = 759,805,504.42/31,120.70
6. Step 6: Final answer
   x = 24,414.79