Finding the Fourth Proportional to 3,978.25, 5,489.83 and 2,209.97

Step by Step Solution

1. Step 1: Write the proportion equation
   3,978.25 : 5,489.83 = 2,209.97 : x
2. Step 2: Convert to fraction form
   3,978.25/5,489.83 = 2,209.97/x
3. Step 3: Cross multiply
   3,978.25x = 5,489.83 × 2,209.97
4. Step 4: Simplify right side
   3,978.25x = 12,132,359.61
5. Step 5: Solve for x
   x = 12,132,359.61/3,978.25
6. Step 6: Final answer
   x = 3,049.67