Finding the Third Proportional to 406,436 and 890,360

Step by Step Solution

1. Step 1: Write the proportion equation
   406,436 : 890,360 = 890,360 : x
2. Step 2: Convert to fraction form
   406,436/890,360 = 890,360/x
3. Step 3: Cross multiply
   406,436x = 890,360 × 890,360
4. Step 4: Simplify right side
   406,436x = 792,740,929,600
5. Step 5: Solve for x
   x = 792,740,929,600/406,436
6. Step 6: Final answer
   x = 1,950,469.27