Finding the Third Proportional to 990,972 and 2,171,268

Step by Step Solution

1. Step 1: Write the proportion equation
   990,972 : 2,171,268 = 2,171,268 : x
2. Step 2: Convert to fraction form
   990,972/2,171,268 = 2,171,268/x
3. Step 3: Cross multiply
   990,972x = 2,171,268 × 2,171,268
4. Step 4: Simplify right side
   990,972x = 4,714,404,727,824
5. Step 5: Solve for x
   x = 4,714,404,727,824/990,972
6. Step 6: Final answer
   x = 4,757,354.12