Finding the Third Proportional to 2,789,978 and 3,948,899

Step by Step Solution

1. Step 1: Write the proportion equation
   2,789,978 : 3,948,899 = 3,948,899 : x
2. Step 2: Convert to fraction form
   2,789,978/3,948,899 = 3,948,899/x
3. Step 3: Cross multiply
   2,789,978x = 3,948,899 × 3,948,899
4. Step 4: Simplify right side
   2,789,978x = 15,593,803,312,201
5. Step 5: Solve for x
   x = 15,593,803,312,201/2,789,978
6. Step 6: Final answer
   x = 5,589,220.89