Finding the Fourth Proportional to 2,639.25, 3,957.69 and 1,406.37

Step by Step Solution

1. Step 1: Write the proportion equation
   2,639.25 : 3,957.69 = 1,406.37 : x
2. Step 2: Convert to fraction form
   2,639.25/3,957.69 = 1,406.37/x
3. Step 3: Cross multiply
   2,639.25x = 3,957.69 × 1,406.37
4. Step 4: Simplify right side
   2,639.25x = 5,565,976.49
5. Step 5: Solve for x
   x = 5,565,976.49/2,639.25
6. Step 6: Final answer
   x = 2,108.92