Finding the Fourth Proportional to 2,097.79, 3,147.46 and 865.31

Step by Step Solution

1. Step 1: Write the proportion equation
   2,097.79 : 3,147.46 = 865.31 : x
2. Step 2: Convert to fraction form
   2,097.79/3,147.46 = 865.31/x
3. Step 3: Cross multiply
   2,097.79x = 3,147.46 × 865.31
4. Step 4: Simplify right side
   2,097.79x = 2,723,510.71
5. Step 5: Solve for x
   x = 2,723,510.71/2,097.79
6. Step 6: Final answer
   x = 1,298.28