Finding the Third Proportional to 713,680 and 978,621

Step by Step Solution

1. Step 1: Write the proportion equation
   713,680 : 978,621 = 978,621 : x
2. Step 2: Convert to fraction form
   713,680/978,621 = 978,621/x
3. Step 3: Cross multiply
   713,680x = 978,621 × 978,621
4. Step 4: Simplify right side
   713,680x = 957,699,061,641
5. Step 5: Solve for x
   x = 957,699,061,641/713,680
6. Step 6: Final answer
   x = 1,341,916.63