Finding the Third Proportional to 140,439 and 300,561

Step by Step Solution

1. Step 1: Write the proportion equation
   140,439 : 300,561 = 300,561 : x
2. Step 2: Convert to fraction form
   140,439/300,561 = 300,561/x
3. Step 3: Cross multiply
   140,439x = 300,561 × 300,561
4. Step 4: Simplify right side
   140,439x = 90,336,914,721
5. Step 5: Solve for x
   x = 90,336,914,721/140,439
6. Step 6: Final answer
   x = 643,246.64