Finding the Third Proportional to 713,510 and 978,409

Step by Step Solution

1. Step 1: Write the proportion equation
   713,510 : 978,409 = 978,409 : x
2. Step 2: Convert to fraction form
   713,510/978,409 = 978,409/x
3. Step 3: Cross multiply
   713,510x = 978,409 × 978,409
4. Step 4: Simplify right side
   713,510x = 957,284,171,281
5. Step 5: Solve for x
   x = 957,284,171,281/713,510
6. Step 6: Final answer
   x = 1,341,654.88