Finding the Third Proportional to 3,215,421 and 7,078,539

Step by Step Solution

1. Step 1: Write the proportion equation
   3,215,421 : 7,078,539 = 7,078,539 : x
2. Step 2: Convert to fraction form
   3,215,421/7,078,539 = 7,078,539/x
3. Step 3: Cross multiply
   3,215,421x = 7,078,539 × 7,078,539
4. Step 4: Simplify right side
   3,215,421x = 50,105,714,374,521
5. Step 5: Solve for x
   x = 50,105,714,374,521/3,215,421
6. Step 6: Final answer
   x = 15,582,940.58