Finding the Fourth Proportional to 31,013.88, 42,797.40 and 16,866.72

Step by Step Solution

1. Step 1: Write the proportion equation
   31,013.88 : 42,797.40 = 16,866.72 : x
2. Step 2: Convert to fraction form
   31,013.88/42,797.40 = 16,866.72/x
3. Step 3: Cross multiply
   31,013.88x = 42,797.40 × 16,866.72
4. Step 4: Simplify right side
   31,013.88x = 721,851,762.53
5. Step 5: Solve for x
   x = 721,851,762.53/31,013.88
6. Step 6: Final answer
   x = 23,275.12