Finding the Fourth Proportional to 2,600.71, 3,899.80 and 868.75

Step by Step Solution

1. Step 1: Write the proportion equation
   2,600.71 : 3,899.80 = 868.75 : x
2. Step 2: Convert to fraction form
   2,600.71/3,899.80 = 868.75/x
3. Step 3: Cross multiply
   2,600.71x = 3,899.80 × 868.75
4. Step 4: Simplify right side
   2,600.71x = 3,387,951.25
5. Step 5: Solve for x
   x = 3,387,951.25/2,600.71
6. Step 6: Final answer
   x = 1,302.70