Finding the Fourth Proportional to 8,792.61, 12,106.89 and 8,087.31

Step by Step Solution

1. Step 1: Write the proportion equation
   8,792.61 : 12,106.89 = 8,087.31 : x
2. Step 2: Convert to fraction form
   8,792.61/12,106.89 = 8,087.31/x
3. Step 3: Cross multiply
   8,792.61x = 12,106.89 × 8,087.31
4. Step 4: Simplify right side
   8,792.61x = 97,912,172.57
5. Step 5: Solve for x
   x = 97,912,172.57/8,792.61
6. Step 6: Final answer
   x = 11,135.73