Finding the Third Proportional to 300,555 and 449,890

Step by Step Solution

1. Step 1: Write the proportion equation
   300,555 : 449,890 = 449,890 : x
2. Step 2: Convert to fraction form
   300,555/449,890 = 449,890/x
3. Step 3: Cross multiply
   300,555x = 449,890 × 449,890
4. Step 4: Simplify right side
   300,555x = 202,401,012,100
5. Step 5: Solve for x
   x = 202,401,012,100/300,555
6. Step 6: Final answer
   x = 673,424.21