Finding the Third Proportional to 623,900 and 892,200

Step by Step Solution

1. Step 1: Write the proportion equation
   623,900 : 892,200 = 892,200 : x
2. Step 2: Convert to fraction form
   623,900/892,200 = 892,200/x
3. Step 3: Cross multiply
   623,900x = 892,200 × 892,200
4. Step 4: Simplify right side
   623,900x = 796,020,840,000
5. Step 5: Solve for x
   x = 796,020,840,000/623,900
6. Step 6: Final answer
   x = 1,275,878.89