Finding the Third Proportional to 3,578,864 and 5,420,418

Step by Step Solution

1. Step 1: Write the proportion equation
   3,578,864 : 5,420,418 = 5,420,418 : x
2. Step 2: Convert to fraction form
   3,578,864/5,420,418 = 5,420,418/x
3. Step 3: Cross multiply
   3,578,864x = 5,420,418 × 5,420,418
4. Step 4: Simplify right side
   3,578,864x = 29,380,931,294,724
5. Step 5: Solve for x
   x = 29,380,931,294,724/3,578,864
6. Step 6: Final answer
   x = 8,209,569.10