Finding the Third Proportional to 990,412 and 2,170,681

Step by Step Solution

1. Step 1: Write the proportion equation
   990,412 : 2,170,681 = 2,170,681 : x
2. Step 2: Convert to fraction form
   990,412/2,170,681 = 2,170,681/x
3. Step 3: Cross multiply
   990,412x = 2,170,681 × 2,170,681
4. Step 4: Simplify right side
   990,412x = 4,711,856,003,761
5. Step 5: Solve for x
   x = 4,711,856,003,761/990,412
6. Step 6: Final answer
   x = 4,757,470.63