Finding the Third Proportional to 455,400 and 679,401

Step by Step Solution

1. Step 1: Write the proportion equation
   455,400 : 679,401 = 679,401 : x
2. Step 2: Convert to fraction form
   455,400/679,401 = 679,401/x
3. Step 3: Cross multiply
   455,400x = 679,401 × 679,401
4. Step 4: Simplify right side
   455,400x = 461,585,718,801
5. Step 5: Solve for x
   x = 461,585,718,801/455,400
6. Step 6: Final answer
   x = 1,013,583.05