Finding the Fourth Proportional to 2,639.97, 3,956.46 and 1,404.72

Step by Step Solution

1. Step 1: Write the proportion equation
   2,639.97 : 3,956.46 = 1,404.72 : x
2. Step 2: Convert to fraction form
   2,639.97/3,956.46 = 1,404.72/x
3. Step 3: Cross multiply
   2,639.97x = 3,956.46 × 1,404.72
4. Step 4: Simplify right side
   2,639.97x = 5,557,713.22
5. Step 5: Solve for x
   x = 5,557,713.22/2,639.97
6. Step 6: Final answer
   x = 2,105.22