Finding the Third Proportional to 3,643,991 and 7,974,430

Step by Step Solution

1. Step 1: Write the proportion equation
   3,643,991 : 7,974,430 = 7,974,430 : x
2. Step 2: Convert to fraction form
   3,643,991/7,974,430 = 7,974,430/x
3. Step 3: Cross multiply
   3,643,991x = 7,974,430 × 7,974,430
4. Step 4: Simplify right side
   3,643,991x = 63,591,533,824,900
5. Step 5: Solve for x
   x = 63,591,533,824,900/3,643,991
6. Step 6: Final answer
   x = 17,451,067.75