Finding the Fourth Proportional to 31,002.82, 42,783.77 and 16,855.70

Step by Step Solution

1. Step 1: Write the proportion equation
   31,002.82 : 42,783.77 = 16,855.70 : x
2. Step 2: Convert to fraction form
   31,002.82/42,783.77 = 16,855.70/x
3. Step 3: Cross multiply
   31,002.82x = 42,783.77 × 16,855.70
4. Step 4: Simplify right side
   31,002.82x = 721,150,391.99
5. Step 5: Solve for x
   x = 721,150,391.99/31,002.82
6. Step 6: Final answer
   x = 23,260.80