Finding the Third Proportional to 3,961,629 and 8,680,443

Step by Step Solution

1. Step 1: Write the proportion equation
   3,961,629 : 8,680,443 = 8,680,443 : x
2. Step 2: Convert to fraction form
   3,961,629/8,680,443 = 8,680,443/x
3. Step 3: Cross multiply
   3,961,629x = 8,680,443 × 8,680,443
4. Step 4: Simplify right side
   3,961,629x = 75,350,090,676,249
5. Step 5: Solve for x
   x = 75,350,090,676,249/3,961,629
6. Step 6: Final answer
   x = 19,019,976.55