Finding the Third Proportional to 3,931,540 and 8,409,564

Step by Step Solution

1. Step 1: Write the proportion equation
   3,931,540 : 8,409,564 = 8,409,564 : x
2. Step 2: Convert to fraction form
   3,931,540/8,409,564 = 8,409,564/x
3. Step 3: Cross multiply
   3,931,540x = 8,409,564 × 8,409,564
4. Step 4: Simplify right side
   3,931,540x = 70,720,766,670,096
5. Step 5: Solve for x
   x = 70,720,766,670,096/3,931,540
6. Step 6: Final answer
   x = 17,988,057.27