Finding the Third Proportional to 1,244,390 and 1,978,656

Step by Step Solution

1. Step 1: Write the proportion equation
   1,244,390 : 1,978,656 = 1,978,656 : x
2. Step 2: Convert to fraction form
   1,244,390/1,978,656 = 1,978,656/x
3. Step 3: Cross multiply
   1,244,390x = 1,978,656 × 1,978,656
4. Step 4: Simplify right side
   1,244,390x = 3,915,079,566,336
5. Step 5: Solve for x
   x = 3,915,079,566,336/1,244,390
6. Step 6: Final answer
   x = 3,146,183.73