Finding the Third Proportional to 300,684 and 451,890

Step by Step Solution

1. Step 1: Write the proportion equation
   300,684 : 451,890 = 451,890 : x
2. Step 2: Convert to fraction form
   300,684/451,890 = 451,890/x
3. Step 3: Cross multiply
   300,684x = 451,890 × 451,890
4. Step 4: Simplify right side
   300,684x = 204,204,572,100
5. Step 5: Solve for x
   x = 204,204,572,100/300,684
6. Step 6: Final answer
   x = 679,133.48