Finding the Fourth Proportional to 2,097.90, 3,147.51 and 865.89

Step by Step Solution

1. Step 1: Write the proportion equation
   2,097.90 : 3,147.51 = 865.89 : x
2. Step 2: Convert to fraction form
   2,097.90/3,147.51 = 865.89/x
3. Step 3: Cross multiply
   2,097.90x = 3,147.51 × 865.89
4. Step 4: Simplify right side
   2,097.90x = 2,725,397.43
5. Step 5: Solve for x
   x = 2,725,397.43/2,097.90
6. Step 6: Final answer
   x = 1,299.11