Finding the Third Proportional to 4,209,216 and 6,778,978

Step by Step Solution

1. Step 1: Write the proportion equation
   4,209,216 : 6,778,978 = 6,778,978 : x
2. Step 2: Convert to fraction form
   4,209,216/6,778,978 = 6,778,978/x
3. Step 3: Cross multiply
   4,209,216x = 6,778,978 × 6,778,978
4. Step 4: Simplify right side
   4,209,216x = 45,954,542,724,484
5. Step 5: Solve for x
   x = 45,954,542,724,484/4,209,216
6. Step 6: Final answer
   x = 10,917,601.45