Finding the Third Proportional to 3,171,978 and 4,758,939

Step by Step Solution

1. Step 1: Write the proportion equation
   3,171,978 : 4,758,939 = 4,758,939 : x
2. Step 2: Convert to fraction form
   3,171,978/4,758,939 = 4,758,939/x
3. Step 3: Cross multiply
   3,171,978x = 4,758,939 × 4,758,939
4. Step 4: Simplify right side
   3,171,978x = 22,647,500,405,721
5. Step 5: Solve for x
   x = 22,647,500,405,721/3,171,978
6. Step 6: Final answer
   x = 7,139,866.80