Finding the Third Proportional to 131,172 and 285,708

Step by Step Solution

1. Step 1: Write the proportion equation
   131,172 : 285,708 = 285,708 : x
2. Step 2: Convert to fraction form
   131,172/285,708 = 285,708/x
3. Step 3: Cross multiply
   131,172x = 285,708 × 285,708
4. Step 4: Simplify right side
   131,172x = 81,629,061,264
5. Step 5: Solve for x
   x = 81,629,061,264/131,172
6. Step 6: Final answer
   x = 622,305.53