Finding the Third Proportional to 287,614.50 and 627,139.50

Step by Step Solution

1. Step 1: Write the proportion equation
   287,614.50 : 627,139.50 = 627,139.50 : x
2. Step 2: Convert to fraction form
   287,614.50/627,139.50 = 627,139.50/x
3. Step 3: Cross multiply
   287,614.50x = 627,139.50 × 627,139.50
4. Step 4: Simplify right side
   287,614.50x = 393,303,952,460.25
5. Step 5: Solve for x
   x = 393,303,952,460.25/287,614.50
6. Step 6: Final answer
   x = 1,367,469.14