Finding the Third Proportional to 200,556 and 300,878

Step by Step Solution

1. Step 1: Write the proportion equation
   200,556 : 300,878 = 300,878 : x
2. Step 2: Convert to fraction form
   200,556/300,878 = 300,878/x
3. Step 3: Cross multiply
   200,556x = 300,878 × 300,878
4. Step 4: Simplify right side
   200,556x = 90,527,570,884
5. Step 5: Solve for x
   x = 90,527,570,884/200,556
6. Step 6: Final answer
   x = 451,383.01