Finding the Third Proportional to 81,109 and 108,495

Step by Step Solution

1. Step 1: Write the proportion equation
   81,109 : 108,495 = 108,495 : x
2. Step 2: Convert to fraction form
   81,109/108,495 = 108,495/x
3. Step 3: Cross multiply
   81,109x = 108,495 × 108,495
4. Step 4: Simplify right side
   81,109x = 11,771,165,025
5. Step 5: Solve for x
   x = 11,771,165,025/81,109
6. Step 6: Final answer
   x = 145,127.73