Finding the Fourth Proportional to 2,099.31, 3,146.24 and 865.49

Step by Step Solution

1. Step 1: Write the proportion equation
   2,099.31 : 3,146.24 = 865.49 : x
2. Step 2: Convert to fraction form
   2,099.31/3,146.24 = 865.49/x
3. Step 3: Cross multiply
   2,099.31x = 3,146.24 × 865.49
4. Step 4: Simplify right side
   2,099.31x = 2,723,019.20
5. Step 5: Solve for x
   x = 2,723,019.20/2,099.31
6. Step 6: Final answer
   x = 1,297.10