Finding the Fourth Proportional to 2,568.79, 3,853.55 and 814.29

Step by Step Solution

1. Step 1: Write the proportion equation
   2,568.79 : 3,853.55 = 814.29 : x
2. Step 2: Convert to fraction form
   2,568.79/3,853.55 = 814.29/x
3. Step 3: Cross multiply
   2,568.79x = 3,853.55 × 814.29
4. Step 4: Simplify right side
   2,568.79x = 3,137,907.23
5. Step 5: Solve for x
   x = 3,137,907.23/2,568.79
6. Step 6: Final answer
   x = 1,221.55