Finding the Third Proportional to 300,890 and 660,820

Step by Step Solution

1. Step 1: Write the proportion equation
   300,890 : 660,820 = 660,820 : x
2. Step 2: Convert to fraction form
   300,890/660,820 = 660,820/x
3. Step 3: Cross multiply
   300,890x = 660,820 × 660,820
4. Step 4: Simplify right side
   300,890x = 436,683,072,400
5. Step 5: Solve for x
   x = 436,683,072,400/300,890
6. Step 6: Final answer
   x = 1,451,304.70