Finding the Fourth Proportional to 31,002.90, 42,784.14 and 16,855.68

Step by Step Solution

1. Step 1: Write the proportion equation
   31,002.90 : 42,784.14 = 16,855.68 : x
2. Step 2: Convert to fraction form
   31,002.90/42,784.14 = 16,855.68/x
3. Step 3: Cross multiply
   31,002.90x = 42,784.14 × 16,855.68
4. Step 4: Simplify right side
   31,002.90x = 721,155,772.92
5. Step 5: Solve for x
   x = 721,155,772.92/31,002.90
6. Step 6: Final answer
   x = 23,260.91