Finding the Third Proportional to 713,498 and 978,390

Step by Step Solution

1. Step 1: Write the proportion equation
   713,498 : 978,390 = 978,390 : x
2. Step 2: Convert to fraction form
   713,498/978,390 = 978,390/x
3. Step 3: Cross multiply
   713,498x = 978,390 × 978,390
4. Step 4: Simplify right side
   713,498x = 957,246,992,100
5. Step 5: Solve for x
   x = 957,246,992,100/713,498
6. Step 6: Final answer
   x = 1,341,625.33