Finding the Fourth Proportional to 2,639.24, 3,958.28 and 1,078.83

Step by Step Solution

1. Step 1: Write the proportion equation
   2,639.24 : 3,958.28 = 1,078.83 : x
2. Step 2: Convert to fraction form
   2,639.24/3,958.28 = 1,078.83/x
3. Step 3: Cross multiply
   2,639.24x = 3,958.28 × 1,078.83
4. Step 4: Simplify right side
   2,639.24x = 4,270,305.82
5. Step 5: Solve for x
   x = 4,270,305.82/2,639.24
6. Step 6: Final answer
   x = 1,618.01