Finding the Third Proportional to 111.50 and 245

Step by Step Solution

1. Step 1: Write the proportion equation
   111.50 : 245 = 245 : x
2. Step 2: Convert to fraction form
   111.50/245 = 245/x
3. Step 3: Cross multiply
   111.50x = 245 × 245
4. Step 4: Simplify right side
   111.50x = 60,025
5. Step 5: Solve for x
   x = 60,025/111.50
6. Step 6: Final answer
   x = 538.34