Finding the Third Proportional to 80,636.50 and 128,105

Step by Step Solution

1. Step 1: Write the proportion equation
   80,636.50 : 128,105 = 128,105 : x
2. Step 2: Convert to fraction form
   80,636.50/128,105 = 128,105/x
3. Step 3: Cross multiply
   80,636.50x = 128,105 × 128,105
4. Step 4: Simplify right side
   80,636.50x = 16,410,891,025
5. Step 5: Solve for x
   x = 16,410,891,025/80,636.50
6. Step 6: Final answer
   x = 203,516.91