Finding the Third Proportional to 128,853 and 200,386.50

Step by Step Solution

1. Step 1: Write the proportion equation
   128,853 : 200,386.50 = 200,386.50 : x
2. Step 2: Convert to fraction form
   128,853/200,386.50 = 200,386.50/x
3. Step 3: Cross multiply
   128,853x = 200,386.50 × 200,386.50
4. Step 4: Simplify right side
   128,853x = 40,154,749,382.25
5. Step 5: Solve for x
   x = 40,154,749,382.25/128,853
6. Step 6: Final answer
   x = 311,632.24