Finding the Fourth Proportional to 8,778.53, 12,120.72 and 5,425.94

Step by Step Solution

1. Step 1: Write the proportion equation
   8,778.53 : 12,120.72 = 5,425.94 : x
2. Step 2: Convert to fraction form
   8,778.53/12,120.72 = 5,425.94/x
3. Step 3: Cross multiply
   8,778.53x = 12,120.72 × 5,425.94
4. Step 4: Simplify right side
   8,778.53x = 65,766,329.78
5. Step 5: Solve for x
   x = 65,766,329.78/8,778.53
6. Step 6: Final answer
   x = 7,491.72