Finding the Third Proportional to 128,105 and 204,650

Step by Step Solution

1. Step 1: Write the proportion equation
   128,105 : 204,650 = 204,650 : x
2. Step 2: Convert to fraction form
   128,105/204,650 = 204,650/x
3. Step 3: Cross multiply
   128,105x = 204,650 × 204,650
4. Step 4: Simplify right side
   128,105x = 41,881,622,500
5. Step 5: Solve for x
   x = 41,881,622,500/128,105
6. Step 6: Final answer
   x = 326,931.99