Finding the Fourth Proportional to 2,815.10, 4,222.54 and 867.25

Step by Step Solution

1. Step 1: Write the proportion equation
   2,815.10 : 4,222.54 = 867.25 : x
2. Step 2: Convert to fraction form
   2,815.10/4,222.54 = 867.25/x
3. Step 3: Cross multiply
   2,815.10x = 4,222.54 × 867.25
4. Step 4: Simplify right side
   2,815.10x = 3,661,997.82
5. Step 5: Solve for x
   x = 3,661,997.82/2,815.10
6. Step 6: Final answer
   x = 1,300.84