Finding the Third Proportional to 5,215,593 and 7,978,407

Step by Step Solution

1. Step 1: Write the proportion equation
   5,215,593 : 7,978,407 = 7,978,407 : x
2. Step 2: Convert to fraction form
   5,215,593/7,978,407 = 7,978,407/x
3. Step 3: Cross multiply
   5,215,593x = 7,978,407 × 7,978,407
4. Step 4: Simplify right side
   5,215,593x = 63,654,978,257,649
5. Step 5: Solve for x
   x = 63,654,978,257,649/5,215,593
6. Step 6: Final answer
   x = 12,204,744.17