Finding the Fourth Proportional to 2,568, 3,854.78 and 1,272.21

Step by Step Solution

1. Step 1: Write the proportion equation
   2,568 : 3,854.78 = 1,272.21 : x
2. Step 2: Convert to fraction form
   2,568/3,854.78 = 1,272.21/x
3. Step 3: Cross multiply
   2,568x = 3,854.78 × 1,272.21
4. Step 4: Simplify right side
   2,568x = 4,904,083.30
5. Step 5: Solve for x
   x = 4,904,083.30/2,568
6. Step 6: Final answer
   x = 1,909.69