Finding the Fourth Proportional to 9,259.98, 12,778.78 and 5,280.98

Step by Step Solution

1. Step 1: Write the proportion equation
   9,259.98 : 12,778.78 = 5,280.98 : x
2. Step 2: Convert to fraction form
   9,259.98/12,778.78 = 5,280.98/x
3. Step 3: Cross multiply
   9,259.98x = 12,778.78 × 5,280.98
4. Step 4: Simplify right side
   9,259.98x = 67,484,481.60
5. Step 5: Solve for x
   x = 67,484,481.60/9,259.98
6. Step 6: Final answer
   x = 7,287.76