Finding the Third Proportional to 641.56 and 995.38

Step by Step Solution

1. Step 1: Write the proportion equation
   641.56 : 995.38 = 995.38 : x
2. Step 2: Convert to fraction form
   641.56/995.38 = 995.38/x
3. Step 3: Cross multiply
   641.56x = 995.38 × 995.38
4. Step 4: Simplify right side
   641.56x = 990,771.39
5. Step 5: Solve for x
   x = 990,771.39/641.56
6. Step 6: Final answer
   x = 1,544.31