Finding the Third Proportional to 131,120 and 287,512

Step by Step Solution

1. Step 1: Write the proportion equation
   131,120 : 287,512 = 287,512 : x
2. Step 2: Convert to fraction form
   131,120/287,512 = 287,512/x
3. Step 3: Cross multiply
   131,120x = 287,512 × 287,512
4. Step 4: Simplify right side
   131,120x = 82,663,150,144
5. Step 5: Solve for x
   x = 82,663,150,144/131,120
6. Step 6: Final answer
   x = 630,438.91