Finding the Fourth Proportional to 3,940.79, 5,440.52 and 2,616.31

Step by Step Solution

1. Step 1: Write the proportion equation
   3,940.79 : 5,440.52 = 2,616.31 : x
2. Step 2: Convert to fraction form
   3,940.79/5,440.52 = 2,616.31/x
3. Step 3: Cross multiply
   3,940.79x = 5,440.52 × 2,616.31
4. Step 4: Simplify right side
   3,940.79x = 14,234,046.60
5. Step 5: Solve for x
   x = 14,234,046.60/3,940.79
6. Step 6: Final answer
   x = 3,611.98