Finding the Third Proportional to 171.18 and 374.31

Step by Step Solution

1. Step 1: Write the proportion equation
   171.18 : 374.31 = 374.31 : x
2. Step 2: Convert to fraction form
   171.18/374.31 = 374.31/x
3. Step 3: Cross multiply
   171.18x = 374.31 × 374.31
4. Step 4: Simplify right side
   171.18x = 140,106.92
5. Step 5: Solve for x
   x = 140,106.92/171.18
6. Step 6: Final answer
   x = 818.50