Finding the Third Proportional to 140,508 and 300,690

Step by Step Solution

1. Step 1: Write the proportion equation
   140,508 : 300,690 = 300,690 : x
2. Step 2: Convert to fraction form
   140,508/300,690 = 300,690/x
3. Step 3: Cross multiply
   140,508x = 300,690 × 300,690
4. Step 4: Simplify right side
   140,508x = 90,414,476,100
5. Step 5: Solve for x
   x = 90,414,476,100/140,508
6. Step 6: Final answer
   x = 643,482.76