Finding the Third Proportional to 5,215,968 and 7,978,932

Step by Step Solution

1. Step 1: Write the proportion equation
   5,215,968 : 7,978,932 = 7,978,932 : x
2. Step 2: Convert to fraction form
   5,215,968/7,978,932 = 7,978,932/x
3. Step 3: Cross multiply
   5,215,968x = 7,978,932 × 7,978,932
4. Step 4: Simplify right side
   5,215,968x = 63,663,355,860,624
5. Step 5: Solve for x
   x = 63,663,355,860,624/5,215,968
6. Step 6: Final answer
   x = 12,205,472.86