Finding the Third Proportional to 3,923,172 and 8,447,499

Step by Step Solution

1. Step 1: Write the proportion equation
   3,923,172 : 8,447,499 = 8,447,499 : x
2. Step 2: Convert to fraction form
   3,923,172/8,447,499 = 8,447,499/x
3. Step 3: Cross multiply
   3,923,172x = 8,447,499 × 8,447,499
4. Step 4: Simplify right side
   3,923,172x = 71,360,239,355,001
5. Step 5: Solve for x
   x = 71,360,239,355,001/3,923,172
6. Step 6: Final answer
   x = 18,189,424.11