Finding the Third Proportional to 3,988,260 and 8,698,320

Step by Step Solution

1. Step 1: Write the proportion equation
   3,988,260 : 8,698,320 = 8,698,320 : x
2. Step 2: Convert to fraction form
   3,988,260/8,698,320 = 8,698,320/x
3. Step 3: Cross multiply
   3,988,260x = 8,698,320 × 8,698,320
4. Step 4: Simplify right side
   3,988,260x = 75,660,770,822,400
5. Step 5: Solve for x
   x = 75,660,770,822,400/3,988,260
6. Step 6: Final answer
   x = 18,970,872.22