Finding the Third Proportional to 140,257.50 and 300,609

Step by Step Solution

1. Step 1: Write the proportion equation
   140,257.50 : 300,609 = 300,609 : x
2. Step 2: Convert to fraction form
   140,257.50/300,609 = 300,609/x
3. Step 3: Cross multiply
   140,257.50x = 300,609 × 300,609
4. Step 4: Simplify right side
   140,257.50x = 90,365,770,881
5. Step 5: Solve for x
   x = 90,365,770,881/140,257.50
6. Step 6: Final answer
   x = 644,284.77