Finding the Third Proportional to 3,945,870 and 8,479,160

Step by Step Solution

1. Step 1: Write the proportion equation
   3,945,870 : 8,479,160 = 8,479,160 : x
2. Step 2: Convert to fraction form
   3,945,870/8,479,160 = 8,479,160/x
3. Step 3: Cross multiply
   3,945,870x = 8,479,160 × 8,479,160
4. Step 4: Simplify right side
   3,945,870x = 71,896,154,305,600
5. Step 5: Solve for x
   x = 71,896,154,305,600/3,945,870
6. Step 6: Final answer
   x = 18,220,608.97