Finding the Third Proportional to 677,456 and 990,748

Step by Step Solution

1. Step 1: Write the proportion equation
   677,456 : 990,748 = 990,748 : x
2. Step 2: Convert to fraction form
   677,456/990,748 = 990,748/x
3. Step 3: Cross multiply
   677,456x = 990,748 × 990,748
4. Step 4: Simplify right side
   677,456x = 981,581,599,504
5. Step 5: Solve for x
   x = 981,581,599,504/677,456
6. Step 6: Final answer
   x = 1,448,923.03