Finding the Third Proportional to 111.50 and 187

Step by Step Solution

1. Step 1: Write the proportion equation
   111.50 : 187 = 187 : x
2. Step 2: Convert to fraction form
   111.50/187 = 187/x
3. Step 3: Cross multiply
   111.50x = 187 × 187
4. Step 4: Simplify right side
   111.50x = 34,969
5. Step 5: Solve for x
   x = 34,969/111.50
6. Step 6: Final answer
   x = 313.62