Finding the Fourth Proportional to 31,003.62, 42,784.79 and 16,856.46

Step by Step Solution

1. Step 1: Write the proportion equation
   31,003.62 : 42,784.79 = 16,856.46 : x
2. Step 2: Convert to fraction form
   31,003.62/42,784.79 = 16,856.46/x
3. Step 3: Cross multiply
   31,003.62x = 42,784.79 × 16,856.46
4. Step 4: Simplify right side
   31,003.62x = 721,200,177.40
5. Step 5: Solve for x
   x = 721,200,177.40/31,003.62
6. Step 6: Final answer
   x = 23,261.81