Finding the Third Proportional to 405,820 and 630,834

Step by Step Solution

1. Step 1: Write the proportion equation
   405,820 : 630,834 = 630,834 : x
2. Step 2: Convert to fraction form
   405,820/630,834 = 630,834/x
3. Step 3: Cross multiply
   405,820x = 630,834 × 630,834
4. Step 4: Simplify right side
   405,820x = 397,951,535,556
5. Step 5: Solve for x
   x = 397,951,535,556/405,820
6. Step 6: Final answer
   x = 980,610.95