Finding the Third Proportional to 810,648 and 1,211,436

Step by Step Solution

1. Step 1: Write the proportion equation
   810,648 : 1,211,436 = 1,211,436 : x
2. Step 2: Convert to fraction form
   810,648/1,211,436 = 1,211,436/x
3. Step 3: Cross multiply
   810,648x = 1,211,436 × 1,211,436
4. Step 4: Simplify right side
   810,648x = 1,467,577,182,096
5. Step 5: Solve for x
   x = 1,467,577,182,096/810,648
6. Step 6: Final answer
   x = 1,810,375.38