Finding the Fourth Proportional to 31,019.88, 42,807.02 and 16,872.72

Step by Step Solution

1. Step 1: Write the proportion equation
   31,019.88 : 42,807.02 = 16,872.72 : x
2. Step 2: Convert to fraction form
   31,019.88/42,807.02 = 16,872.72/x
3. Step 3: Cross multiply
   31,019.88x = 42,807.02 × 16,872.72
4. Step 4: Simplify right side
   31,019.88x = 722,270,862.49
5. Step 5: Solve for x
   x = 722,270,862.49/31,019.88
6. Step 6: Final answer
   x = 23,284.13