Finding the Fourth Proportional to 31,086.96, 42,900 and 18,340.32

Step by Step Solution

1. Step 1: Write the proportion equation
   31,086.96 : 42,900 = 18,340.32 : x
2. Step 2: Convert to fraction form
   31,086.96/42,900 = 18,340.32/x
3. Step 3: Cross multiply
   31,086.96x = 42,900 × 18,340.32
4. Step 4: Simplify right side
   31,086.96x = 786,799,728
5. Step 5: Solve for x
   x = 786,799,728/31,086.96
6. Step 6: Final answer
   x = 25,309.64