Finding the Third Proportional to 3,579,978 and 5,421,963

Step by Step Solution

1. Step 1: Write the proportion equation
   3,579,978 : 5,421,963 = 5,421,963 : x
2. Step 2: Convert to fraction form
   3,579,978/5,421,963 = 5,421,963/x
3. Step 3: Cross multiply
   3,579,978x = 5,421,963 × 5,421,963
4. Step 4: Simplify right side
   3,579,978x = 29,397,682,773,369
5. Step 5: Solve for x
   x = 29,397,682,773,369/3,579,978
6. Step 6: Final answer
   x = 8,211,693.70