Finding the Fourth Proportional to 2,167.80, 3,251.88 and 868.56

Step by Step Solution

1. Step 1: Write the proportion equation
   2,167.80 : 3,251.88 = 868.56 : x
2. Step 2: Convert to fraction form
   2,167.80/3,251.88 = 868.56/x
3. Step 3: Cross multiply
   2,167.80x = 3,251.88 × 868.56
4. Step 4: Simplify right side
   2,167.80x = 2,824,452.89
5. Step 5: Solve for x
   x = 2,824,452.89/2,167.80
6. Step 6: Final answer
   x = 1,302.91