Finding the Fourth Proportional to 31,091.40, 42,904.56 and 17,660.88

Step by Step Solution

1. Step 1: Write the proportion equation
   31,091.40 : 42,904.56 = 17,660.88 : x
2. Step 2: Convert to fraction form
   31,091.40/42,904.56 = 17,660.88/x
3. Step 3: Cross multiply
   31,091.40x = 42,904.56 × 17,660.88
4. Step 4: Simplify right side
   31,091.40x = 757,732,285.61
5. Step 5: Solve for x
   x = 757,732,285.61/31,091.40
6. Step 6: Final answer
   x = 24,371.12