Finding the Third Proportional to 3,972,482 and 8,421,628

Step by Step Solution

1. Step 1: Write the proportion equation
   3,972,482 : 8,421,628 = 8,421,628 : x
2. Step 2: Convert to fraction form
   3,972,482/8,421,628 = 8,421,628/x
3. Step 3: Cross multiply
   3,972,482x = 8,421,628 × 8,421,628
4. Step 4: Simplify right side
   3,972,482x = 70,923,818,170,384
5. Step 5: Solve for x
   x = 70,923,818,170,384/3,972,482
6. Step 6: Final answer
   x = 17,853,779.62