Finding the Fourth Proportional to 22,818.78, 31,489.86 and 12,882.78

Step by Step Solution

1. Step 1: Write the proportion equation
   22,818.78 : 31,489.86 = 12,882.78 : x
2. Step 2: Convert to fraction form
   22,818.78/31,489.86 = 12,882.78/x
3. Step 3: Cross multiply
   22,818.78x = 31,489.86 × 12,882.78
4. Step 4: Simplify right side
   22,818.78x = 405,676,938.61
5. Step 5: Solve for x
   x = 405,676,938.61/22,818.78
6. Step 6: Final answer
   x = 17,778.20