Finding the Fourth Proportional to 31,120.14, 42,945.60 and 17,691.39

Step by Step Solution

1. Step 1: Write the proportion equation
   31,120.14 : 42,945.60 = 17,691.39 : x
2. Step 2: Convert to fraction form
   31,120.14/42,945.60 = 17,691.39/x
3. Step 3: Cross multiply
   31,120.14x = 42,945.60 × 17,691.39
4. Step 4: Simplify right side
   31,120.14x = 759,767,453.09
5. Step 5: Solve for x
   x = 759,767,453.09/31,120.14
6. Step 6: Final answer
   x = 24,414.01