Finding the Fourth Proportional to 9,258.56, 12,776.04 and 5,279.60

Step by Step Solution

1. Step 1: Write the proportion equation
   9,258.56 : 12,776.04 = 5,279.60 : x
2. Step 2: Convert to fraction form
   9,258.56/12,776.04 = 5,279.60/x
3. Step 3: Cross multiply
   9,258.56x = 12,776.04 × 5,279.60
4. Step 4: Simplify right side
   9,258.56x = 67,452,380.78
5. Step 5: Solve for x
   x = 67,452,380.78/9,258.56
6. Step 6: Final answer
   x = 7,285.41