Finding the Third Proportional to 140,469 and 300,621

Step by Step Solution

1. Step 1: Write the proportion equation
   140,469 : 300,621 = 300,621 : x
2. Step 2: Convert to fraction form
   140,469/300,621 = 300,621/x
3. Step 3: Cross multiply
   140,469x = 300,621 × 300,621
4. Step 4: Simplify right side
   140,469x = 90,372,985,641
5. Step 5: Solve for x
   x = 90,372,985,641/140,469
6. Step 6: Final answer
   x = 643,366.05