Finding the Third Proportional to 144,920 and 309,100

Step by Step Solution

1. Step 1: Write the proportion equation
   144,920 : 309,100 = 309,100 : x
2. Step 2: Convert to fraction form
   144,920/309,100 = 309,100/x
3. Step 3: Cross multiply
   144,920x = 309,100 × 309,100
4. Step 4: Simplify right side
   144,920x = 95,542,810,000
5. Step 5: Solve for x
   x = 95,542,810,000/144,920
6. Step 6: Final answer
   x = 659,279.67