Finding the Third Proportional to 3,987,578 and 8,772,628

Step by Step Solution

1. Step 1: Write the proportion equation
   3,987,578 : 8,772,628 = 8,772,628 : x
2. Step 2: Convert to fraction form
   3,987,578/8,772,628 = 8,772,628/x
3. Step 3: Cross multiply
   3,987,578x = 8,772,628 × 8,772,628
4. Step 4: Simplify right side
   3,987,578x = 76,959,002,026,384
5. Step 5: Solve for x
   x = 76,959,002,026,384/3,987,578
6. Step 6: Final answer
   x = 19,299,685.68