Finding the Third Proportional to 677,520 and 990,834

Step by Step Solution

1. Step 1: Write the proportion equation
   677,520 : 990,834 = 990,834 : x
2. Step 2: Convert to fraction form
   677,520/990,834 = 990,834/x
3. Step 3: Cross multiply
   677,520x = 990,834 × 990,834
4. Step 4: Simplify right side
   677,520x = 981,752,015,556
5. Step 5: Solve for x
   x = 981,752,015,556/677,520
6. Step 6: Final answer
   x = 1,449,037.69