Finding the Third Proportional to 311,110.50 and 664,866

Step by Step Solution

1. Step 1: Write the proportion equation
   311,110.50 : 664,866 = 664,866 : x
2. Step 2: Convert to fraction form
   311,110.50/664,866 = 664,866/x
3. Step 3: Cross multiply
   311,110.50x = 664,866 × 664,866
4. Step 4: Simplify right side
   311,110.50x = 442,046,797,956
5. Step 5: Solve for x
   x = 442,046,797,956/311,110.50
6. Step 6: Final answer
   x = 1,420,867.50