Finding the Fourth Proportional to 31,002.60, 42,783.12 and 16,855.32

Step by Step Solution

1. Step 1: Write the proportion equation
   31,002.60 : 42,783.12 = 16,855.32 : x
2. Step 2: Convert to fraction form
   31,002.60/42,783.12 = 16,855.32/x
3. Step 3: Cross multiply
   31,002.60x = 42,783.12 × 16,855.32
4. Step 4: Simplify right side
   31,002.60x = 721,123,178.20
5. Step 5: Solve for x
   x = 721,123,178.20/31,002.60
6. Step 6: Final answer
   x = 23,260.09