Finding the Fourth Proportional to 31,003.89, 42,785.19 and 16,856.43

Step by Step Solution

1. Step 1: Write the proportion equation
   31,003.89 : 42,785.19 = 16,856.43 : x
2. Step 2: Convert to fraction form
   31,003.89/42,785.19 = 16,856.43/x
3. Step 3: Cross multiply
   31,003.89x = 42,785.19 × 16,856.43
4. Step 4: Simplify right side
   31,003.89x = 721,205,560.27
5. Step 5: Solve for x
   x = 721,205,560.27/31,003.89
6. Step 6: Final answer
   x = 23,261.78