Finding the Fourth Proportional to 2,639.94, 3,957.16 and 1,408.83

Step by Step Solution

1. Step 1: Write the proportion equation
   2,639.94 : 3,957.16 = 1,408.83 : x
2. Step 2: Convert to fraction form
   2,639.94/3,957.16 = 1,408.83/x
3. Step 3: Cross multiply
   2,639.94x = 3,957.16 × 1,408.83
4. Step 4: Simplify right side
   2,639.94x = 5,574,965.72
5. Step 5: Solve for x
   x = 5,574,965.72/2,639.94
6. Step 6: Final answer
   x = 2,111.78