Finding the Third Proportional to 128,856 and 204,996

Step by Step Solution

1. Step 1: Write the proportion equation
   128,856 : 204,996 = 204,996 : x
2. Step 2: Convert to fraction form
   128,856/204,996 = 204,996/x
3. Step 3: Cross multiply
   128,856x = 204,996 × 204,996
4. Step 4: Simplify right side
   128,856x = 42,023,360,016
5. Step 5: Solve for x
   x = 42,023,360,016/128,856
6. Step 6: Final answer
   x = 326,126.53