Finding the Third Proportional to 311,627 and 669,806.50

Step by Step Solution

1. Step 1: Write the proportion equation
   311,627 : 669,806.50 = 669,806.50 : x
2. Step 2: Convert to fraction form
   311,627/669,806.50 = 669,806.50/x
3. Step 3: Cross multiply
   311,627x = 669,806.50 × 669,806.50
4. Step 4: Simplify right side
   311,627x = 448,640,747,442.25
5. Step 5: Solve for x
   x = 448,640,747,442.25/311,627
6. Step 6: Final answer
   x = 1,439,672.26