Finding the Fourth Proportional to 3,984.48, 5,480.28 and 3,196.80

Step by Step Solution

1. Step 1: Write the proportion equation
   3,984.48 : 5,480.28 = 3,196.80 : x
2. Step 2: Convert to fraction form
   3,984.48/5,480.28 = 3,196.80/x
3. Step 3: Cross multiply
   3,984.48x = 5,480.28 × 3,196.80
4. Step 4: Simplify right side
   3,984.48x = 17,519,359.10
5. Step 5: Solve for x
   x = 17,519,359.10/3,984.48
6. Step 6: Final answer
   x = 4,396.90