Finding the Fourth Proportional to 9,258.89, 12,778.29 and 5,280.98

Step by Step Solution

1. Step 1: Write the proportion equation
   9,258.89 : 12,778.29 = 5,280.98 : x
2. Step 2: Convert to fraction form
   9,258.89/12,778.29 = 5,280.98/x
3. Step 3: Cross multiply
   9,258.89x = 12,778.29 × 5,280.98
4. Step 4: Simplify right side
   9,258.89x = 67,481,830.03
5. Step 5: Solve for x
   x = 67,481,830.03/9,258.89
6. Step 6: Final answer
   x = 7,288.33