Finding the Third Proportional to 868.50 and 979.50

Step by Step Solution

1. Step 1: Write the proportion equation
   868.50 : 979.50 = 979.50 : x
2. Step 2: Convert to fraction form
   868.50/979.50 = 979.50/x
3. Step 3: Cross multiply
   868.50x = 979.50 × 979.50
4. Step 4: Simplify right side
   868.50x = 959,420.25
5. Step 5: Solve for x
   x = 959,420.25/868.50
6. Step 6: Final answer
   x = 1,104.69