Finding the Third Proportional to 3,578,854 and 5,420,403

Step by Step Solution

1. Step 1: Write the proportion equation
   3,578,854 : 5,420,403 = 5,420,403 : x
2. Step 2: Convert to fraction form
   3,578,854/5,420,403 = 5,420,403/x
3. Step 3: Cross multiply
   3,578,854x = 5,420,403 × 5,420,403
4. Step 4: Simplify right side
   3,578,854x = 29,380,768,682,409
5. Step 5: Solve for x
   x = 29,380,768,682,409/3,578,854
6. Step 6: Final answer
   x = 8,209,546.60