Finding the Third Proportional to 128,606 and 200,271

Step by Step Solution

1. Step 1: Write the proportion equation
   128,606 : 200,271 = 200,271 : x
2. Step 2: Convert to fraction form
   128,606/200,271 = 200,271/x
3. Step 3: Cross multiply
   128,606x = 200,271 × 200,271
4. Step 4: Simplify right side
   128,606x = 40,108,473,441
5. Step 5: Solve for x
   x = 40,108,473,441/128,606
6. Step 6: Final answer
   x = 311,870.93