Finding the Third Proportional to 90.89 and 136.83

Step by Step Solution

1. Step 1: Write the proportion equation
   90.89 : 136.83 = 136.83 : x
2. Step 2: Convert to fraction form
   90.89/136.83 = 136.83/x
3. Step 3: Cross multiply
   90.89x = 136.83 × 136.83
4. Step 4: Simplify right side
   90.89x = 18,721.94
5. Step 5: Solve for x
   x = 18,721.94/90.89
6. Step 6: Final answer
   x = 205.98