Finding the Third Proportional to 713,638 and 978,558

Step by Step Solution

1. Step 1: Write the proportion equation
   713,638 : 978,558 = 978,558 : x
2. Step 2: Convert to fraction form
   713,638/978,558 = 978,558/x
3. Step 3: Cross multiply
   713,638x = 978,558 × 978,558
4. Step 4: Simplify right side
   713,638x = 957,575,759,364
5. Step 5: Solve for x
   x = 957,575,759,364/713,638
6. Step 6: Final answer
   x = 1,341,822.83