Finding the Third Proportional to 311,837 and 660,481.50

Step by Step Solution

1. Step 1: Write the proportion equation
   311,837 : 660,481.50 = 660,481.50 : x
2. Step 2: Convert to fraction form
   311,837/660,481.50 = 660,481.50/x
3. Step 3: Cross multiply
   311,837x = 660,481.50 × 660,481.50
4. Step 4: Simplify right side
   311,837x = 436,235,811,842.25
5. Step 5: Solve for x
   x = 436,235,811,842.25/311,837
6. Step 6: Final answer
   x = 1,398,922.55