Finding the Fourth Proportional to 3,679.96, 5,480.48 and 3,658.90

Step by Step Solution

1. Step 1: Write the proportion equation
   3,679.96 : 5,480.48 = 3,658.90 : x
2. Step 2: Convert to fraction form
   3,679.96/5,480.48 = 3,658.90/x
3. Step 3: Cross multiply
   3,679.96x = 5,480.48 × 3,658.90
4. Step 4: Simplify right side
   3,679.96x = 20,052,528.27
5. Step 5: Solve for x
   x = 20,052,528.27/3,679.96
6. Step 6: Final answer
   x = 5,449.12