Finding the Third Proportional to 83.43 and 128.30

Step by Step Solution

1. Step 1: Write the proportion equation
   83.43 : 128.30 = 128.30 : x
2. Step 2: Convert to fraction form
   83.43/128.30 = 128.30/x
3. Step 3: Cross multiply
   83.43x = 128.30 × 128.30
4. Step 4: Simplify right side
   83.43x = 16,461.59
5. Step 5: Solve for x
   x = 16,461.59/83.43
6. Step 6: Final answer
   x = 197.32