Finding the Third Proportional to 131.06 and 285.61

Step by Step Solution

1. Step 1: Write the proportion equation
   131.06 : 285.61 = 285.61 : x
2. Step 2: Convert to fraction form
   131.06/285.61 = 285.61/x
3. Step 3: Cross multiply
   131.06x = 285.61 × 285.61
4. Step 4: Simplify right side
   131.06x = 81,572.72
5. Step 5: Solve for x
   x = 81,572.72/131.06
6. Step 6: Final answer
   x = 622.40