Finding the Fourth Proportional to 2,639.24, 3,957.69 and 1,406.39

Step by Step Solution

1. Step 1: Write the proportion equation
   2,639.24 : 3,957.69 = 1,406.39 : x
2. Step 2: Convert to fraction form
   2,639.24/3,957.69 = 1,406.39/x
3. Step 3: Cross multiply
   2,639.24x = 3,957.69 × 1,406.39
4. Step 4: Simplify right side
   2,639.24x = 5,566,041.12
5. Step 5: Solve for x
   x = 5,566,041.12/2,639.24
6. Step 6: Final answer
   x = 2,108.96