Finding the Fourth Proportional to 2,713.83, 4,071.38 and 865.05

Step by Step Solution

1. Step 1: Write the proportion equation
   2,713.83 : 4,071.38 = 865.05 : x
2. Step 2: Convert to fraction form
   2,713.83/4,071.38 = 865.05/x
3. Step 3: Cross multiply
   2,713.83x = 4,071.38 × 865.05
4. Step 4: Simplify right side
   2,713.83x = 3,521,942.94
5. Step 5: Solve for x
   x = 3,521,942.94/2,713.83
6. Step 6: Final answer
   x = 1,297.78