Finding the Third Proportional to 287,631 and 627,169.50

Step by Step Solution

1. Step 1: Write the proportion equation
   287,631 : 627,169.50 = 627,169.50 : x
2. Step 2: Convert to fraction form
   287,631/627,169.50 = 627,169.50/x
3. Step 3: Cross multiply
   287,631x = 627,169.50 × 627,169.50
4. Step 4: Simplify right side
   287,631x = 393,341,581,730.25
5. Step 5: Solve for x
   x = 393,341,581,730.25/287,631
6. Step 6: Final answer
   x = 1,367,521.52