Finding the Fourth Proportional to 8,787.88, 12,128.71 and 5,064.04

Step by Step Solution

1. Step 1: Write the proportion equation
   8,787.88 : 12,128.71 = 5,064.04 : x
2. Step 2: Convert to fraction form
   8,787.88/12,128.71 = 5,064.04/x
3. Step 3: Cross multiply
   8,787.88x = 12,128.71 × 5,064.04
4. Step 4: Simplify right side
   8,787.88x = 61,420,211.94
5. Step 5: Solve for x
   x = 61,420,211.94/8,787.88
6. Step 6: Final answer
   x = 6,989.20