Finding the Fourth Proportional to 8,788.15, 12,150.98 and 7,680.98

Step by Step Solution

1. Step 1: Write the proportion equation
   8,788.15 : 12,150.98 = 7,680.98 : x
2. Step 2: Convert to fraction form
   8,788.15/12,150.98 = 7,680.98/x
3. Step 3: Cross multiply
   8,788.15x = 12,150.98 × 7,680.98
4. Step 4: Simplify right side
   8,788.15x = 93,331,434.36
5. Step 5: Solve for x
   x = 93,331,434.36/8,788.15
6. Step 6: Final answer
   x = 10,620.15