Finding the Third Proportional to 144,892.69 and 311,209.88

Step by Step Solution

1. Step 1: Write the proportion equation
   144,892.69 : 311,209.88 = 311,209.88 : x
2. Step 2: Convert to fraction form
   144,892.69/311,209.88 = 311,209.88/x
3. Step 3: Cross multiply
   144,892.69x = 311,209.88 × 311,209.88
4. Step 4: Simplify right side
   144,892.69x = 96,851,586,297.52
5. Step 5: Solve for x
   x = 96,851,586,297.52/144,892.69
6. Step 6: Final answer
   x = 668,436.68