Finding the Third Proportional to 1,213,978 and 2,659,238

Step by Step Solution

1. Step 1: Write the proportion equation
   1,213,978 : 2,659,238 = 2,659,238 : x
2. Step 2: Convert to fraction form
   1,213,978/2,659,238 = 2,659,238/x
3. Step 3: Cross multiply
   1,213,978x = 2,659,238 × 2,659,238
4. Step 4: Simplify right side
   1,213,978x = 7,071,546,740,644
5. Step 5: Solve for x
   x = 7,071,546,740,644/1,213,978
6. Step 6: Final answer
   x = 5,825,102.88