Finding the Third Proportional to 868.22 and 1,108.69

Step by Step Solution

1. Step 1: Write the proportion equation
   868.22 : 1,108.69 = 1,108.69 : x
2. Step 2: Convert to fraction form
   868.22/1,108.69 = 1,108.69/x
3. Step 3: Cross multiply
   868.22x = 1,108.69 × 1,108.69
4. Step 4: Simplify right side
   868.22x = 1,229,187.97
5. Step 5: Solve for x
   x = 1,229,187.97/868.22
6. Step 6: Final answer
   x = 1,415.76