Finding the Third Proportional to 131,571 and 288,138

Step by Step Solution

1. Step 1: Write the proportion equation
   131,571 : 288,138 = 288,138 : x
2. Step 2: Convert to fraction form
   131,571/288,138 = 288,138/x
3. Step 3: Cross multiply
   131,571x = 288,138 × 288,138
4. Step 4: Simplify right side
   131,571x = 83,023,507,044
5. Step 5: Solve for x
   x = 83,023,507,044/131,571
6. Step 6: Final answer
   x = 631,016.77