Finding the Third Proportional to 82,499 and 128,676

Step by Step Solution

1. Step 1: Write the proportion equation
   82,499 : 128,676 = 128,676 : x
2. Step 2: Convert to fraction form
   82,499/128,676 = 128,676/x
3. Step 3: Cross multiply
   82,499x = 128,676 × 128,676
4. Step 4: Simplify right side
   82,499x = 16,557,512,976
5. Step 5: Solve for x
   x = 16,557,512,976/82,499
6. Step 6: Final answer
   x = 200,699.56