Finding the Third Proportional to 269,628 and 422,931

Step by Step Solution

1. Step 1: Write the proportion equation
   269,628 : 422,931 = 422,931 : x
2. Step 2: Convert to fraction form
   269,628/422,931 = 422,931/x
3. Step 3: Cross multiply
   269,628x = 422,931 × 422,931
4. Step 4: Simplify right side
   269,628x = 178,870,630,761
5. Step 5: Solve for x
   x = 178,870,630,761/269,628
6. Step 6: Final answer
   x = 663,397.83