Finding the Third Proportional to 140,436 and 300,555

Step by Step Solution

1. Step 1: Write the proportion equation
   140,436 : 300,555 = 300,555 : x
2. Step 2: Convert to fraction form
   140,436/300,555 = 300,555/x
3. Step 3: Cross multiply
   140,436x = 300,555 × 300,555
4. Step 4: Simplify right side
   140,436x = 90,333,308,025
5. Step 5: Solve for x
   x = 90,333,308,025/140,436
6. Step 6: Final answer
   x = 643,234.70