Finding the Third Proportional to 311,626 and 669,804.50

Step by Step Solution

1. Step 1: Write the proportion equation
   311,626 : 669,804.50 = 669,804.50 : x
2. Step 2: Convert to fraction form
   311,626/669,804.50 = 669,804.50/x
3. Step 3: Cross multiply
   311,626x = 669,804.50 × 669,804.50
4. Step 4: Simplify right side
   311,626x = 448,638,068,220.25
5. Step 5: Solve for x
   x = 448,638,068,220.25/311,626
6. Step 6: Final answer
   x = 1,439,668.28