Finding the Third Proportional to 3,929,488 and 8,456,553

Step by Step Solution

1. Step 1: Write the proportion equation
   3,929,488 : 8,456,553 = 8,456,553 : x
2. Step 2: Convert to fraction form
   3,929,488/8,456,553 = 8,456,553/x
3. Step 3: Cross multiply
   3,929,488x = 8,456,553 × 8,456,553
4. Step 4: Simplify right side
   3,929,488x = 71,513,288,641,809
5. Step 5: Solve for x
   x = 71,513,288,641,809/3,929,488
6. Step 6: Final answer
   x = 18,199,136.54