Finding the Third Proportional to 200,908.50 and 422,505

Step by Step Solution

1. Step 1: Write the proportion equation
   200,908.50 : 422,505 = 422,505 : x
2. Step 2: Convert to fraction form
   200,908.50/422,505 = 422,505/x
3. Step 3: Cross multiply
   200,908.50x = 422,505 × 422,505
4. Step 4: Simplify right side
   200,908.50x = 178,510,475,025
5. Step 5: Solve for x
   x = 178,510,475,025/200,908.50
6. Step 6: Final answer
   x = 888,516.29