Finding the Fourth Proportional to 31,092.40, 42,905.94 and 17,661.88

Step by Step Solution

1. Step 1: Write the proportion equation
   31,092.40 : 42,905.94 = 17,661.88 : x
2. Step 2: Convert to fraction form
   31,092.40/42,905.94 = 17,661.88/x
3. Step 3: Cross multiply
   31,092.40x = 42,905.94 × 17,661.88
4. Step 4: Simplify right side
   31,092.40x = 757,799,563.57
5. Step 5: Solve for x
   x = 757,799,563.57/31,092.40
6. Step 6: Final answer
   x = 24,372.50