Finding the Fourth Proportional to 31,003.83, 42,784.88 and 16,856.91

Step by Step Solution

1. Step 1: Write the proportion equation
   31,003.83 : 42,784.88 = 16,856.91 : x
2. Step 2: Convert to fraction form
   31,003.83/42,784.88 = 16,856.91/x
3. Step 3: Cross multiply
   31,003.83x = 42,784.88 × 16,856.91
4. Step 4: Simplify right side
   31,003.83x = 721,220,787.24
5. Step 5: Solve for x
   x = 721,220,787.24/31,003.83
6. Step 6: Final answer
   x = 23,262.31