Finding the Fourth Proportional to 8,778.97, 12,116.15 and 5,644.27

Step by Step Solution

1. Step 1: Write the proportion equation
   8,778.97 : 12,116.15 = 5,644.27 : x
2. Step 2: Convert to fraction form
   8,778.97/12,116.15 = 5,644.27/x
3. Step 3: Cross multiply
   8,778.97x = 12,116.15 × 5,644.27
4. Step 4: Simplify right side
   8,778.97x = 68,386,821.96
5. Step 5: Solve for x
   x = 68,386,821.96/8,778.97
6. Step 6: Final answer
   x = 7,789.85