Finding the Fourth Proportional to 2,097.72, 3,143.85 and 863.89

Step by Step Solution

1. Step 1: Write the proportion equation
   2,097.72 : 3,143.85 = 863.89 : x
2. Step 2: Convert to fraction form
   2,097.72/3,143.85 = 863.89/x
3. Step 3: Cross multiply
   2,097.72x = 3,143.85 × 863.89
4. Step 4: Simplify right side
   2,097.72x = 2,715,929.48
5. Step 5: Solve for x
   x = 2,715,929.48/2,097.72
6. Step 6: Final answer
   x = 1,294.71