Finding the Third Proportional to 677,570 and 990,886

Step by Step Solution

1. Step 1: Write the proportion equation
   677,570 : 990,886 = 990,886 : x
2. Step 2: Convert to fraction form
   677,570/990,886 = 990,886/x
3. Step 3: Cross multiply
   677,570x = 990,886 × 990,886
4. Step 4: Simplify right side
   677,570x = 981,855,064,996
5. Step 5: Solve for x
   x = 981,855,064,996/677,570
6. Step 6: Final answer
   x = 1,449,082.85