Finding the Third Proportional to 3,961,638 and 8,680,470

Step by Step Solution

1. Step 1: Write the proportion equation
   3,961,638 : 8,680,470 = 8,680,470 : x
2. Step 2: Convert to fraction form
   3,961,638/8,680,470 = 8,680,470/x
3. Step 3: Cross multiply
   3,961,638x = 8,680,470 × 8,680,470
4. Step 4: Simplify right side
   3,961,638x = 75,350,559,420,900
5. Step 5: Solve for x
   x = 75,350,559,420,900/3,961,638
6. Step 6: Final answer
   x = 19,020,051.66