Finding the Fourth Proportional to 4,086.72, 5,639.20 and 2,408.16

Step by Step Solution

1. Step 1: Write the proportion equation
   4,086.72 : 5,639.20 = 2,408.16 : x
2. Step 2: Convert to fraction form
   4,086.72/5,639.20 = 2,408.16/x
3. Step 3: Cross multiply
   4,086.72x = 5,639.20 × 2,408.16
4. Step 4: Simplify right side
   4,086.72x = 13,580,095.87
5. Step 5: Solve for x
   x = 13,580,095.87/4,086.72
6. Step 6: Final answer
   x = 3,322.98