Finding the Third Proportional to 131,198 and 287,020

Step by Step Solution

1. Step 1: Write the proportion equation
   131,198 : 287,020 = 287,020 : x
2. Step 2: Convert to fraction form
   131,198/287,020 = 287,020/x
3. Step 3: Cross multiply
   131,198x = 287,020 × 287,020
4. Step 4: Simplify right side
   131,198x = 82,380,480,400
5. Step 5: Solve for x
   x = 82,380,480,400/131,198
6. Step 6: Final answer
   x = 627,909.57