Finding the Third Proportional to 3,499,578 and 7,278,507

Step by Step Solution

1. Step 1: Write the proportion equation
   3,499,578 : 7,278,507 = 7,278,507 : x
2. Step 2: Convert to fraction form
   3,499,578/7,278,507 = 7,278,507/x
3. Step 3: Cross multiply
   3,499,578x = 7,278,507 × 7,278,507
4. Step 4: Simplify right side
   3,499,578x = 52,976,664,149,049
5. Step 5: Solve for x
   x = 52,976,664,149,049/3,499,578
6. Step 6: Final answer
   x = 15,138,014.97