Finding the Third Proportional to 143,285.50 and 311,447

Step by Step Solution

1. Step 1: Write the proportion equation
   143,285.50 : 311,447 = 311,447 : x
2. Step 2: Convert to fraction form
   143,285.50/311,447 = 311,447/x
3. Step 3: Cross multiply
   143,285.50x = 311,447 × 311,447
4. Step 4: Simplify right side
   143,285.50x = 96,999,233,809
5. Step 5: Solve for x
   x = 96,999,233,809/143,285.50
6. Step 6: Final answer
   x = 676,964.76