Finding the Fourth Proportional to 2,713.87, 4,070.73 and 865.10

Step by Step Solution

1. Step 1: Write the proportion equation
   2,713.87 : 4,070.73 = 865.10 : x
2. Step 2: Convert to fraction form
   2,713.87/4,070.73 = 865.10/x
3. Step 3: Cross multiply
   2,713.87x = 4,070.73 × 865.10
4. Step 4: Simplify right side
   2,713.87x = 3,521,576.61
5. Step 5: Solve for x
   x = 3,521,576.61/2,713.87
6. Step 6: Final answer
   x = 1,297.62