Finding the Third Proportional to 128,852 and 204,990

Step by Step Solution

1. Step 1: Write the proportion equation
   128,852 : 204,990 = 204,990 : x
2. Step 2: Convert to fraction form
   128,852/204,990 = 204,990/x
3. Step 3: Cross multiply
   128,852x = 204,990 × 204,990
4. Step 4: Simplify right side
   128,852x = 42,020,900,100
5. Step 5: Solve for x
   x = 42,020,900,100/128,852
6. Step 6: Final answer
   x = 326,117.56