Finding the Fourth Proportional to 31,120.23, 42,945.73 and 17,691.49

Step by Step Solution

1. Step 1: Write the proportion equation
   31,120.23 : 42,945.73 = 17,691.49 : x
2. Step 2: Convert to fraction form
   31,120.23/42,945.73 = 17,691.49/x
3. Step 3: Cross multiply
   31,120.23x = 42,945.73 × 17,691.49
4. Step 4: Simplify right side
   31,120.23x = 759,773,952.84
5. Step 5: Solve for x
   x = 759,773,952.84/31,120.23
6. Step 6: Final answer
   x = 24,414.15