Finding the Third Proportional to 144,939.38 and 309,136.50

Step by Step Solution

1. Step 1: Write the proportion equation
   144,939.38 : 309,136.50 = 309,136.50 : x
2. Step 2: Convert to fraction form
   144,939.38/309,136.50 = 309,136.50/x
3. Step 3: Cross multiply
   144,939.38x = 309,136.50 × 309,136.50
4. Step 4: Simplify right side
   144,939.38x = 95,565,375,632.25
5. Step 5: Solve for x
   x = 95,565,375,632.25/144,939.38
6. Step 6: Final answer
   x = 659,347.23