Finding the Third Proportional to 5,215,981 and 7,978,952

Step by Step Solution

1. Step 1: Write the proportion equation
   5,215,981 : 7,978,952 = 7,978,952 : x
2. Step 2: Convert to fraction form
   5,215,981/7,978,952 = 7,978,952/x
3. Step 3: Cross multiply
   5,215,981x = 7,978,952 × 7,978,952
4. Step 4: Simplify right side
   5,215,981x = 63,663,675,018,304
5. Step 5: Solve for x
   x = 63,663,675,018,304/5,215,981
6. Step 6: Final answer
   x = 12,205,503.63