Finding the Third Proportional to 978,642 and 2,149,740

Step by Step Solution

1. Step 1: Write the proportion equation
   978,642 : 2,149,740 = 2,149,740 : x
2. Step 2: Convert to fraction form
   978,642/2,149,740 = 2,149,740/x
3. Step 3: Cross multiply
   978,642x = 2,149,740 × 2,149,740
4. Step 4: Simplify right side
   978,642x = 4,621,382,067,600
5. Step 5: Solve for x
   x = 4,621,382,067,600/978,642
6. Step 6: Final answer
   x = 4,722,239.66