Finding the Third Proportional to 85.50 and 134.25

Step by Step Solution

1. Step 1: Write the proportion equation
   85.50 : 134.25 = 134.25 : x
2. Step 2: Convert to fraction form
   85.50/134.25 = 134.25/x
3. Step 3: Cross multiply
   85.50x = 134.25 × 134.25
4. Step 4: Simplify right side
   85.50x = 18,023.06
5. Step 5: Solve for x
   x = 18,023.06/85.50
6. Step 6: Final answer
   x = 210.80