Finding the Fourth Proportional to 2,815.36, 4,222.80 and 867.38

Step by Step Solution

1. Step 1: Write the proportion equation
   2,815.36 : 4,222.80 = 867.38 : x
2. Step 2: Convert to fraction form
   2,815.36/4,222.80 = 867.38/x
3. Step 3: Cross multiply
   2,815.36x = 4,222.80 × 867.38
4. Step 4: Simplify right side
   2,815.36x = 3,662,751.15
5. Step 5: Solve for x
   x = 3,662,751.15/2,815.36
6. Step 6: Final answer
   x = 1,300.99