Finding the Third Proportional to 3,945,402 and 8,621,262

Step by Step Solution

1. Step 1: Write the proportion equation
   3,945,402 : 8,621,262 = 8,621,262 : x
2. Step 2: Convert to fraction form
   3,945,402/8,621,262 = 8,621,262/x
3. Step 3: Cross multiply
   3,945,402x = 8,621,262 × 8,621,262
4. Step 4: Simplify right side
   3,945,402x = 74,326,158,472,644
5. Step 5: Solve for x
   x = 74,326,158,472,644/3,945,402
6. Step 6: Final answer
   x = 18,838,678.16