Finding the Fourth Proportional to 12,778.53, 17,616.15 and 9,940.92

Step by Step Solution

1. Step 1: Write the proportion equation
   12,778.53 : 17,616.15 = 9,940.92 : x
2. Step 2: Convert to fraction form
   12,778.53/17,616.15 = 9,940.92/x
3. Step 3: Cross multiply
   12,778.53x = 17,616.15 × 9,940.92
4. Step 4: Simplify right side
   12,778.53x = 175,120,737.86
5. Step 5: Solve for x
   x = 175,120,737.86/12,778.53
6. Step 6: Final answer
   x = 13,704.29