Finding the Third Proportional to 679.50 and 868.50

Step by Step Solution

1. Step 1: Write the proportion equation
   679.50 : 868.50 = 868.50 : x
2. Step 2: Convert to fraction form
   679.50/868.50 = 868.50/x
3. Step 3: Cross multiply
   679.50x = 868.50 × 868.50
4. Step 4: Simplify right side
   679.50x = 754,292.25
5. Step 5: Solve for x
   x = 754,292.25/679.50
6. Step 6: Final answer
   x = 1,110.07