Finding the Fourth Proportional to 3,968.20, 5,923.32 and 3,679.10

Step by Step Solution

1. Step 1: Write the proportion equation
   3,968.20 : 5,923.32 = 3,679.10 : x
2. Step 2: Convert to fraction form
   3,968.20/5,923.32 = 3,679.10/x
3. Step 3: Cross multiply
   3,968.20x = 5,923.32 × 3,679.10
4. Step 4: Simplify right side
   3,968.20x = 21,792,519.42
5. Step 5: Solve for x
   x = 21,792,519.42/3,968.20
6. Step 6: Final answer
   x = 5,491.80