Finding the Third Proportional to 287,640 and 627,187.50

Step by Step Solution

1. Step 1: Write the proportion equation
   287,640 : 627,187.50 = 627,187.50 : x
2. Step 2: Convert to fraction form
   287,640/627,187.50 = 627,187.50/x
3. Step 3: Cross multiply
   287,640x = 627,187.50 × 627,187.50
4. Step 4: Simplify right side
   287,640x = 393,364,160,156.25
5. Step 5: Solve for x
   x = 393,364,160,156.25/287,640
6. Step 6: Final answer
   x = 1,367,557.22