Finding the Third Proportional to 396,608 and 773,290

Step by Step Solution

1. Step 1: Write the proportion equation
   396,608 : 773,290 = 773,290 : x
2. Step 2: Convert to fraction form
   396,608/773,290 = 773,290/x
3. Step 3: Cross multiply
   396,608x = 773,290 × 773,290
4. Step 4: Simplify right side
   396,608x = 597,977,424,100
5. Step 5: Solve for x
   x = 597,977,424,100/396,608
6. Step 6: Final answer
   x = 1,507,729.10