Finding the Fourth Proportional to 12,061.92, 18,120.60 and 8,560.62

Step by Step Solution

1. Step 1: Write the proportion equation
   12,061.92 : 18,120.60 = 8,560.62 : x
2. Step 2: Convert to fraction form
   12,061.92/18,120.60 = 8,560.62/x
3. Step 3: Cross multiply
   12,061.92x = 18,120.60 × 8,560.62
4. Step 4: Simplify right side
   12,061.92x = 155,123,570.77
5. Step 5: Solve for x
   x = 155,123,570.77/12,061.92
6. Step 6: Final answer
   x = 12,860.60