Finding the Third Proportional to 5,215,974 and 7,978,941

Step by Step Solution

1. Step 1: Write the proportion equation
   5,215,974 : 7,978,941 = 7,978,941 : x
2. Step 2: Convert to fraction form
   5,215,974/7,978,941 = 7,978,941/x
3. Step 3: Cross multiply
   5,215,974x = 7,978,941 × 7,978,941
4. Step 4: Simplify right side
   5,215,974x = 63,663,499,481,481
5. Step 5: Solve for x
   x = 63,663,499,481,481/5,215,974
6. Step 6: Final answer
   x = 12,205,486.35