Finding the Third Proportional to 20,939,978 and 31,284,879

Step by Step Solution

1. Step 1: Write the proportion equation
   20,939,978 : 31,284,879 = 31,284,879 : x
2. Step 2: Convert to fraction form
   20,939,978/31,284,879 = 31,284,879/x
3. Step 3: Cross multiply
   20,939,978x = 31,284,879 × 31,284,879
4. Step 4: Simplify right side
   20,939,978x = 978,743,654,044,641
5. Step 5: Solve for x
   x = 978,743,654,044,641/20,939,978
6. Step 6: Final answer
   x = 46,740,433.73