Finding the Fourth Proportional to 3,978.24, 5,957.60 and 3,280.64

Step by Step Solution

1. Step 1: Write the proportion equation
   3,978.24 : 5,957.60 = 3,280.64 : x
2. Step 2: Convert to fraction form
   3,978.24/5,957.60 = 3,280.64/x
3. Step 3: Cross multiply
   3,978.24x = 5,957.60 × 3,280.64
4. Step 4: Simplify right side
   3,978.24x = 19,544,740.86
5. Step 5: Solve for x
   x = 19,544,740.86/3,978.24
6. Step 6: Final answer
   x = 4,912.91