Finding the Fourth Proportional to 3,913.82, 5,401.60 and 2,520.62

Step by Step Solution

1. Step 1: Write the proportion equation
   3,913.82 : 5,401.60 = 2,520.62 : x
2. Step 2: Convert to fraction form
   3,913.82/5,401.60 = 2,520.62/x
3. Step 3: Cross multiply
   3,913.82x = 5,401.60 × 2,520.62
4. Step 4: Simplify right side
   3,913.82x = 13,615,380.99
5. Step 5: Solve for x
   x = 13,615,380.99/3,913.82
6. Step 6: Final answer
   x = 3,478.80