Finding the Third Proportional to 131,290 and 287,743

Step by Step Solution

1. Step 1: Write the proportion equation
   131,290 : 287,743 = 287,743 : x
2. Step 2: Convert to fraction form
   131,290/287,743 = 287,743/x
3. Step 3: Cross multiply
   131,290x = 287,743 × 287,743
4. Step 4: Simplify right side
   131,290x = 82,796,034,049
5. Step 5: Solve for x
   x = 82,796,034,049/131,290
6. Step 6: Final answer
   x = 630,634.73