Finding the Fourth Proportional to 31,110.88, 42,931.56 and 17,681.80

Step by Step Solution

1. Step 1: Write the proportion equation
   31,110.88 : 42,931.56 = 17,681.80 : x
2. Step 2: Convert to fraction form
   31,110.88/42,931.56 = 17,681.80/x
3. Step 3: Cross multiply
   31,110.88x = 42,931.56 × 17,681.80
4. Step 4: Simplify right side
   31,110.88x = 759,107,257.61
5. Step 5: Solve for x
   x = 759,107,257.61/31,110.88
6. Step 6: Final answer
   x = 24,400.06