Finding the Third Proportional to 131,516 and 287,644

Step by Step Solution

1. Step 1: Write the proportion equation
   131,516 : 287,644 = 287,644 : x
2. Step 2: Convert to fraction form
   131,516/287,644 = 287,644/x
3. Step 3: Cross multiply
   131,516x = 287,644 × 287,644
4. Step 4: Simplify right side
   131,516x = 82,739,070,736
5. Step 5: Solve for x
   x = 82,739,070,736/131,516
6. Step 6: Final answer
   x = 629,117.91