Finding the Third Proportional to 143,329.50 and 311,580

Step by Step Solution

1. Step 1: Write the proportion equation
   143,329.50 : 311,580 = 311,580 : x
2. Step 2: Convert to fraction form
   143,329.50/311,580 = 311,580/x
3. Step 3: Cross multiply
   143,329.50x = 311,580 × 311,580
4. Step 4: Simplify right side
   143,329.50x = 97,082,096,400
5. Step 5: Solve for x
   x = 97,082,096,400/143,329.50
6. Step 6: Final answer
   x = 677,335.07