Finding the Third Proportional to 3,953,820 and 8,632,631

Step by Step Solution

1. Step 1: Write the proportion equation
   3,953,820 : 8,632,631 = 8,632,631 : x
2. Step 2: Convert to fraction form
   3,953,820/8,632,631 = 8,632,631/x
3. Step 3: Cross multiply
   3,953,820x = 8,632,631 × 8,632,631
4. Step 4: Simplify right side
   3,953,820x = 74,522,317,982,161
5. Step 5: Solve for x
   x = 74,522,317,982,161/3,953,820
6. Step 6: Final answer
   x = 18,848,181.75