Finding the Third Proportional to 300,690 and 660,900

Step by Step Solution

1. Step 1: Write the proportion equation
   300,690 : 660,900 = 660,900 : x
2. Step 2: Convert to fraction form
   300,690/660,900 = 660,900/x
3. Step 3: Cross multiply
   300,690x = 660,900 × 660,900
4. Step 4: Simplify right side
   300,690x = 436,788,810,000
5. Step 5: Solve for x
   x = 436,788,810,000/300,690
6. Step 6: Final answer
   x = 1,452,621.67