Finding the Fourth Proportional to 2,623.78, 3,935.85 and 868.71

Step by Step Solution

1. Step 1: Write the proportion equation
   2,623.78 : 3,935.85 = 868.71 : x
2. Step 2: Convert to fraction form
   2,623.78/3,935.85 = 868.71/x
3. Step 3: Cross multiply
   2,623.78x = 3,935.85 × 868.71
4. Step 4: Simplify right side
   2,623.78x = 3,419,112.25
5. Step 5: Solve for x
   x = 3,419,112.25/2,623.78
6. Step 6: Final answer
   x = 1,303.12