Finding the Third Proportional to 485,636 and 990,550

Step by Step Solution

1. Step 1: Write the proportion equation
   485,636 : 990,550 = 990,550 : x
2. Step 2: Convert to fraction form
   485,636/990,550 = 990,550/x
3. Step 3: Cross multiply
   485,636x = 990,550 × 990,550
4. Step 4: Simplify right side
   485,636x = 981,189,302,500
5. Step 5: Solve for x
   x = 981,189,302,500/485,636
6. Step 6: Final answer
   x = 2,020,421.27