Finding the Third Proportional to 129,320 and 200,705

Step by Step Solution

1. Step 1: Write the proportion equation
   129,320 : 200,705 = 200,705 : x
2. Step 2: Convert to fraction form
   129,320/200,705 = 200,705/x
3. Step 3: Cross multiply
   129,320x = 200,705 × 200,705
4. Step 4: Simplify right side
   129,320x = 40,282,497,025
5. Step 5: Solve for x
   x = 40,282,497,025/129,320
6. Step 6: Final answer
   x = 311,494.72