Finding the Third Proportional to 3,929,490 and 8,456,557

Step by Step Solution

1. Step 1: Write the proportion equation
   3,929,490 : 8,456,557 = 8,456,557 : x
2. Step 2: Convert to fraction form
   3,929,490/8,456,557 = 8,456,557/x
3. Step 3: Cross multiply
   3,929,490x = 8,456,557 × 8,456,557
4. Step 4: Simplify right side
   3,929,490x = 71,513,356,294,249
5. Step 5: Solve for x
   x = 71,513,356,294,249/3,929,490
6. Step 6: Final answer
   x = 18,199,144.49