Finding the Third Proportional to 111.50 and 188

Step by Step Solution

1. Step 1: Write the proportion equation
   111.50 : 188 = 188 : x
2. Step 2: Convert to fraction form
   111.50/188 = 188/x
3. Step 3: Cross multiply
   111.50x = 188 × 188
4. Step 4: Simplify right side
   111.50x = 35,344
5. Step 5: Solve for x
   x = 35,344/111.50
6. Step 6: Final answer
   x = 316.99