Finding the Third Proportional to 131,503 and 287,610

Step by Step Solution

1. Step 1: Write the proportion equation
   131,503 : 287,610 = 287,610 : x
2. Step 2: Convert to fraction form
   131,503/287,610 = 287,610/x
3. Step 3: Cross multiply
   131,503x = 287,610 × 287,610
4. Step 4: Simplify right side
   131,503x = 82,719,512,100
5. Step 5: Solve for x
   x = 82,719,512,100/131,503
6. Step 6: Final answer
   x = 629,031.37