Finding the Third Proportional to 3,945,408 and 8,621,274

Step by Step Solution

1. Step 1: Write the proportion equation
   3,945,408 : 8,621,274 = 8,621,274 : x
2. Step 2: Convert to fraction form
   3,945,408/8,621,274 = 8,621,274/x
3. Step 3: Cross multiply
   3,945,408x = 8,621,274 × 8,621,274
4. Step 4: Simplify right side
   3,945,408x = 74,326,365,383,076
5. Step 5: Solve for x
   x = 74,326,365,383,076/3,945,408
6. Step 6: Final answer
   x = 18,838,701.95