Finding the Third Proportional to 3,578,855 and 5,420,405

Step by Step Solution

1. Step 1: Write the proportion equation
   3,578,855 : 5,420,405 = 5,420,405 : x
2. Step 2: Convert to fraction form
   3,578,855/5,420,405 = 5,420,405/x
3. Step 3: Cross multiply
   3,578,855x = 5,420,405 × 5,420,405
4. Step 4: Simplify right side
   3,578,855x = 29,380,790,364,025
5. Step 5: Solve for x
   x = 29,380,790,364,025/3,578,855
6. Step 6: Final answer
   x = 8,209,550.36