Finding the Fourth Proportional to 2,815.43, 4,223.43 and 867.78

Step by Step Solution

1. Step 1: Write the proportion equation
   2,815.43 : 4,223.43 = 867.78 : x
2. Step 2: Convert to fraction form
   2,815.43/4,223.43 = 867.78/x
3. Step 3: Cross multiply
   2,815.43x = 4,223.43 × 867.78
4. Step 4: Simplify right side
   2,815.43x = 3,665,008.09
5. Step 5: Solve for x
   x = 3,665,008.09/2,815.43
6. Step 6: Final answer
   x = 1,301.76