Finding the Third Proportional to 978,268 and 1,286,418

Step by Step Solution

1. Step 1: Write the proportion equation
   978,268 : 1,286,418 = 1,286,418 : x
2. Step 2: Convert to fraction form
   978,268/1,286,418 = 1,286,418/x
3. Step 3: Cross multiply
   978,268x = 1,286,418 × 1,286,418
4. Step 4: Simplify right side
   978,268x = 1,654,871,270,724
5. Step 5: Solve for x
   x = 1,654,871,270,724/978,268
6. Step 6: Final answer
   x = 1,691,633.86