Finding the Fourth Proportional to 5,280.32, 7,280.88 and 3,949.76

Step by Step Solution

1. Step 1: Write the proportion equation
   5,280.32 : 7,280.88 = 3,949.76 : x
2. Step 2: Convert to fraction form
   5,280.32/7,280.88 = 3,949.76/x
3. Step 3: Cross multiply
   5,280.32x = 7,280.88 × 3,949.76
4. Step 4: Simplify right side
   5,280.32x = 28,757,728.59
5. Step 5: Solve for x
   x = 28,757,728.59/5,280.32
6. Step 6: Final answer
   x = 5,446.21