Finding the Third Proportional to 128,848 and 200,388

Step by Step Solution

1. Step 1: Write the proportion equation
   128,848 : 200,388 = 200,388 : x
2. Step 2: Convert to fraction form
   128,848/200,388 = 200,388/x
3. Step 3: Cross multiply
   128,848x = 200,388 × 200,388
4. Step 4: Simplify right side
   128,848x = 40,155,350,544
5. Step 5: Solve for x
   x = 40,155,350,544/128,848
6. Step 6: Final answer
   x = 311,649.00