Finding the Fourth Proportional to 2,568.09, 3,851.42 and 813.23

Step by Step Solution

1. Step 1: Write the proportion equation
   2,568.09 : 3,851.42 = 813.23 : x
2. Step 2: Convert to fraction form
   2,568.09/3,851.42 = 813.23/x
3. Step 3: Cross multiply
   2,568.09x = 3,851.42 × 813.23
4. Step 4: Simplify right side
   2,568.09x = 3,132,066.96
5. Step 5: Solve for x
   x = 3,132,066.96/2,568.09
6. Step 6: Final answer
   x = 1,219.61