Finding the Fourth Proportional to 9,258.10, 12,775.86 and 5,280.50

Step by Step Solution

1. Step 1: Write the proportion equation
   9,258.10 : 12,775.86 = 5,280.50 : x
2. Step 2: Convert to fraction form
   9,258.10/12,775.86 = 5,280.50/x
3. Step 3: Cross multiply
   9,258.10x = 12,775.86 × 5,280.50
4. Step 4: Simplify right side
   9,258.10x = 67,462,928.73
5. Step 5: Solve for x
   x = 67,462,928.73/9,258.10
6. Step 6: Final answer
   x = 7,286.91