Finding the Fourth Proportional to 2,815.98, 4,224.60 and 868.38

Step by Step Solution

1. Step 1: Write the proportion equation
   2,815.98 : 4,224.60 = 868.38 : x
2. Step 2: Convert to fraction form
   2,815.98/4,224.60 = 868.38/x
3. Step 3: Cross multiply
   2,815.98x = 4,224.60 × 868.38
4. Step 4: Simplify right side
   2,815.98x = 3,668,558.15
5. Step 5: Solve for x
   x = 3,668,558.15/2,815.98
6. Step 6: Final answer
   x = 1,302.76