Finding the Third Proportional to 1,311,215 and 1,978,872

Step by Step Solution

1. Step 1: Write the proportion equation
   1,311,215 : 1,978,872 = 1,978,872 : x
2. Step 2: Convert to fraction form
   1,311,215/1,978,872 = 1,978,872/x
3. Step 3: Cross multiply
   1,311,215x = 1,978,872 × 1,978,872
4. Step 4: Simplify right side
   1,311,215x = 3,915,934,392,384
5. Step 5: Solve for x
   x = 3,915,934,392,384/1,311,215
6. Step 6: Final answer
   x = 2,986,492.98