Finding the Third Proportional to 144,187.50 and 309,687

Step by Step Solution

1. Step 1: Write the proportion equation
   144,187.50 : 309,687 = 309,687 : x
2. Step 2: Convert to fraction form
   144,187.50/309,687 = 309,687/x
3. Step 3: Cross multiply
   144,187.50x = 309,687 × 309,687
4. Step 4: Simplify right side
   144,187.50x = 95,906,037,969
5. Step 5: Solve for x
   x = 95,906,037,969/144,187.50
6. Step 6: Final answer
   x = 665,148.07