Finding the Third Proportional to 81,717 and 128,404.50

Step by Step Solution

1. Step 1: Write the proportion equation
   81,717 : 128,404.50 = 128,404.50 : x
2. Step 2: Convert to fraction form
   81,717/128,404.50 = 128,404.50/x
3. Step 3: Cross multiply
   81,717x = 128,404.50 × 128,404.50
4. Step 4: Simplify right side
   81,717x = 16,487,715,620.25
5. Step 5: Solve for x
   x = 16,487,715,620.25/81,717
6. Step 6: Final answer
   x = 201,766.04