Finding the Fourth Proportional to 31,003.82, 42,785.15 and 16,856.70

Step by Step Solution

1. Step 1: Write the proportion equation
   31,003.82 : 42,785.15 = 16,856.70 : x
2. Step 2: Convert to fraction form
   31,003.82/42,785.15 = 16,856.70/x
3. Step 3: Cross multiply
   31,003.82x = 42,785.15 × 16,856.70
4. Step 4: Simplify right side
   31,003.82x = 721,216,438.01
5. Step 5: Solve for x
   x = 721,216,438.01/31,003.82
6. Step 6: Final answer
   x = 23,262.18