Finding the Third Proportional to 990,820 and 2,109,512

Step by Step Solution

1. Step 1: Write the proportion equation
   990,820 : 2,109,512 = 2,109,512 : x
2. Step 2: Convert to fraction form
   990,820/2,109,512 = 2,109,512/x
3. Step 3: Cross multiply
   990,820x = 2,109,512 × 2,109,512
4. Step 4: Simplify right side
   990,820x = 4,450,040,878,144
5. Step 5: Solve for x
   x = 4,450,040,878,144/990,820
6. Step 6: Final answer
   x = 4,491,270.74