Finding the Third Proportional to 3,578,856 and 5,420,406

Step by Step Solution

1. Step 1: Write the proportion equation
   3,578,856 : 5,420,406 = 5,420,406 : x
2. Step 2: Convert to fraction form
   3,578,856/5,420,406 = 5,420,406/x
3. Step 3: Cross multiply
   3,578,856x = 5,420,406 × 5,420,406
4. Step 4: Simplify right side
   3,578,856x = 29,380,801,204,836
5. Step 5: Solve for x
   x = 29,380,801,204,836/3,578,856
6. Step 6: Final answer
   x = 8,209,551.10