Finding the Fourth Proportional to 31,007.88, 42,789.12 and 16,860.72

Step by Step Solution

1. Step 1: Write the proportion equation
   31,007.88 : 42,789.12 = 16,860.72 : x
2. Step 2: Convert to fraction form
   31,007.88/42,789.12 = 16,860.72/x
3. Step 3: Cross multiply
   31,007.88x = 42,789.12 × 16,860.72
4. Step 4: Simplify right side
   31,007.88x = 721,455,371.37
5. Step 5: Solve for x
   x = 721,455,371.37/31,007.88
6. Step 6: Final answer
   x = 23,266.84