Finding the Third Proportional to 85.43 and 136.69

Step by Step Solution

1. Step 1: Write the proportion equation
   85.43 : 136.69 = 136.69 : x
2. Step 2: Convert to fraction form
   85.43/136.69 = 136.69/x
3. Step 3: Cross multiply
   85.43x = 136.69 × 136.69
4. Step 4: Simplify right side
   85.43x = 18,683.47
5. Step 5: Solve for x
   x = 18,683.47/85.43
6. Step 6: Final answer
   x = 218.70