Finding the Fourth Proportional to 2,815.52, 4,223.69 and 867.88

Step by Step Solution

1. Step 1: Write the proportion equation
   2,815.52 : 4,223.69 = 867.88 : x
2. Step 2: Convert to fraction form
   2,815.52/4,223.69 = 867.88/x
3. Step 3: Cross multiply
   2,815.52x = 4,223.69 × 867.88
4. Step 4: Simplify right side
   2,815.52x = 3,665,630.62
5. Step 5: Solve for x
   x = 3,665,630.62/2,815.52
6. Step 6: Final answer
   x = 1,301.94