Finding the Fourth Proportional to 31,002.96, 42,783.87 and 16,855.81

Step by Step Solution

1. Step 1: Write the proportion equation
   31,002.96 : 42,783.87 = 16,855.81 : x
2. Step 2: Convert to fraction form
   31,002.96/42,783.87 = 16,855.81/x
3. Step 3: Cross multiply
   31,002.96x = 42,783.87 × 16,855.81
4. Step 4: Simplify right side
   31,002.96x = 721,156,740.03
5. Step 5: Solve for x
   x = 721,156,740.03/31,002.96
6. Step 6: Final answer
   x = 23,260.90