Finding the Third Proportional to 4,707,779 and 9,980,503

Step by Step Solution

1. Step 1: Write the proportion equation
   4,707,779 : 9,980,503 = 9,980,503 : x
2. Step 2: Convert to fraction form
   4,707,779/9,980,503 = 9,980,503/x
3. Step 3: Cross multiply
   4,707,779x = 9,980,503 × 9,980,503
4. Step 4: Simplify right side
   4,707,779x = 99,610,440,133,009
5. Step 5: Solve for x
   x = 99,610,440,133,009/4,707,779
6. Step 6: Final answer
   x = 21,158,690.78