Finding the Third Proportional to 140,512 and 300,698

Step by Step Solution

1. Step 1: Write the proportion equation
   140,512 : 300,698 = 300,698 : x
2. Step 2: Convert to fraction form
   140,512/300,698 = 300,698/x
3. Step 3: Cross multiply
   140,512x = 300,698 × 300,698
4. Step 4: Simplify right side
   140,512x = 90,419,287,204
5. Step 5: Solve for x
   x = 90,419,287,204/140,512
6. Step 6: Final answer
   x = 643,498.68