Finding the Fourth Proportional to 2,815.62, 4,223.47 and 867.81

Step by Step Solution

1. Step 1: Write the proportion equation
   2,815.62 : 4,223.47 = 867.81 : x
2. Step 2: Convert to fraction form
   2,815.62/4,223.47 = 867.81/x
3. Step 3: Cross multiply
   2,815.62x = 4,223.47 × 867.81
4. Step 4: Simplify right side
   2,815.62x = 3,665,169.50
5. Step 5: Solve for x
   x = 3,665,169.50/2,815.62
6. Step 6: Final answer
   x = 1,301.73