Finding the Fourth Proportional to 3,940.29, 5,439.83 and 2,615.81

Step by Step Solution

1. Step 1: Write the proportion equation
   3,940.29 : 5,439.83 = 2,615.81 : x
2. Step 2: Convert to fraction form
   3,940.29/5,439.83 = 2,615.81/x
3. Step 3: Cross multiply
   3,940.29x = 5,439.83 × 2,615.81
4. Step 4: Simplify right side
   3,940.29x = 14,229,521.43
5. Step 5: Solve for x
   x = 14,229,521.43/3,940.29
6. Step 6: Final answer
   x = 3,611.29