Finding the Fourth Proportional to 31,002.18, 42,781.80 and 16,855.03

Step by Step Solution

1. Step 1: Write the proportion equation
   31,002.18 : 42,781.80 = 16,855.03 : x
2. Step 2: Convert to fraction form
   31,002.18/42,781.80 = 16,855.03/x
3. Step 3: Cross multiply
   31,002.18x = 42,781.80 × 16,855.03
4. Step 4: Simplify right side
   31,002.18x = 721,088,522.45
5. Step 5: Solve for x
   x = 721,088,522.45/31,002.18
6. Step 6: Final answer
   x = 23,259.28