Finding the Third Proportional to 140,448 and 300,578

Step by Step Solution

1. Step 1: Write the proportion equation
   140,448 : 300,578 = 300,578 : x
2. Step 2: Convert to fraction form
   140,448/300,578 = 300,578/x
3. Step 3: Cross multiply
   140,448x = 300,578 × 300,578
4. Step 4: Simplify right side
   140,448x = 90,347,134,084
5. Step 5: Solve for x
   x = 90,347,134,084/140,448
6. Step 6: Final answer
   x = 643,278.18