Finding the Third Proportional to 3,989,988 and 8,263,800

Step by Step Solution

1. Step 1: Write the proportion equation
   3,989,988 : 8,263,800 = 8,263,800 : x
2. Step 2: Convert to fraction form
   3,989,988/8,263,800 = 8,263,800/x
3. Step 3: Cross multiply
   3,989,988x = 8,263,800 × 8,263,800
4. Step 4: Simplify right side
   3,989,988x = 68,290,390,440,000
5. Step 5: Solve for x
   x = 68,290,390,440,000/3,989,988
6. Step 6: Final answer
   x = 17,115,437.55