Finding the Fourth Proportional to 3,916.59, 5,403.83 and 2,520.15

Step by Step Solution

1. Step 1: Write the proportion equation
   3,916.59 : 5,403.83 = 2,520.15 : x
2. Step 2: Convert to fraction form
   3,916.59/5,403.83 = 2,520.15/x
3. Step 3: Cross multiply
   3,916.59x = 5,403.83 × 2,520.15
4. Step 4: Simplify right side
   3,916.59x = 13,618,449.57
5. Step 5: Solve for x
   x = 13,618,449.57/3,916.59
6. Step 6: Final answer
   x = 3,477.12