Finding the Fourth Proportional to 9,259.34, 12,778.11 and 5,280.82

Step by Step Solution

1. Step 1: Write the proportion equation
   9,259.34 : 12,778.11 = 5,280.82 : x
2. Step 2: Convert to fraction form
   9,259.34/12,778.11 = 5,280.82/x
3. Step 3: Cross multiply
   9,259.34x = 12,778.11 × 5,280.82
4. Step 4: Simplify right side
   9,259.34x = 67,478,898.85
5. Step 5: Solve for x
   x = 67,478,898.85/9,259.34
6. Step 6: Final answer
   x = 7,287.66