Finding the Third Proportional to 713,428 and 978,288

Step by Step Solution

1. Step 1: Write the proportion equation
   713,428 : 978,288 = 978,288 : x
2. Step 2: Convert to fraction form
   713,428/978,288 = 978,288/x
3. Step 3: Cross multiply
   713,428x = 978,288 × 978,288
4. Step 4: Simplify right side
   713,428x = 957,047,410,944
5. Step 5: Solve for x
   x = 957,047,410,944/713,428
6. Step 6: Final answer
   x = 1,341,477.22