Finding the Fourth Proportional to 9,258.99, 12,776.85 and 5,280.54

Step by Step Solution

1. Step 1: Write the proportion equation
   9,258.99 : 12,776.85 = 5,280.54 : x
2. Step 2: Convert to fraction form
   9,258.99/12,776.85 = 5,280.54/x
3. Step 3: Cross multiply
   9,258.99x = 12,776.85 × 5,280.54
4. Step 4: Simplify right side
   9,258.99x = 67,468,667.50
5. Step 5: Solve for x
   x = 67,468,667.50/9,258.99
6. Step 6: Final answer
   x = 7,286.83