Finding the Third Proportional to 200,736 and 300,438

Step by Step Solution

1. Step 1: Write the proportion equation
   200,736 : 300,438 = 300,438 : x
2. Step 2: Convert to fraction form
   200,736/300,438 = 300,438/x
3. Step 3: Cross multiply
   200,736x = 300,438 × 300,438
4. Step 4: Simplify right side
   200,736x = 90,262,991,844
5. Step 5: Solve for x
   x = 90,262,991,844/200,736
6. Step 6: Final answer
   x = 449,660.21