Finding the Fourth Proportional to 3,959.78, 5,468.82 and 2,639.10

Step by Step Solution

1. Step 1: Write the proportion equation
   3,959.78 : 5,468.82 = 2,639.10 : x
2. Step 2: Convert to fraction form
   3,959.78/5,468.82 = 2,639.10/x
3. Step 3: Cross multiply
   3,959.78x = 5,468.82 × 2,639.10
4. Step 4: Simplify right side
   3,959.78x = 14,432,762.86
5. Step 5: Solve for x
   x = 14,432,762.86/3,959.78
6. Step 6: Final answer
   x = 3,644.84