Finding the Third Proportional to 990,402 and 2,170,665

Step by Step Solution

1. Step 1: Write the proportion equation
   990,402 : 2,170,665 = 2,170,665 : x
2. Step 2: Convert to fraction form
   990,402/2,170,665 = 2,170,665/x
3. Step 3: Cross multiply
   990,402x = 2,170,665 × 2,170,665
4. Step 4: Simplify right side
   990,402x = 4,711,786,542,225
5. Step 5: Solve for x
   x = 4,711,786,542,225/990,402
6. Step 6: Final answer
   x = 4,757,448.53