Finding the Fourth Proportional to 9,257.76, 12,775.39 and 5,280.15

Step by Step Solution

1. Step 1: Write the proportion equation
   9,257.76 : 12,775.39 = 5,280.15 : x
2. Step 2: Convert to fraction form
   9,257.76/12,775.39 = 5,280.15/x
3. Step 3: Cross multiply
   9,257.76x = 12,775.39 × 5,280.15
4. Step 4: Simplify right side
   9,257.76x = 67,456,030.02
5. Step 5: Solve for x
   x = 67,456,030.02/9,257.76
6. Step 6: Final answer
   x = 7,286.43