Finding the Third Proportional to 128,019 and 200,830.50

Step by Step Solution

1. Step 1: Write the proportion equation
   128,019 : 200,830.50 = 200,830.50 : x
2. Step 2: Convert to fraction form
   128,019/200,830.50 = 200,830.50/x
3. Step 3: Cross multiply
   128,019x = 200,830.50 × 200,830.50
4. Step 4: Simplify right side
   128,019x = 40,332,889,730.25
5. Step 5: Solve for x
   x = 40,332,889,730.25/128,019
6. Step 6: Final answer
   x = 315,053.94