Finding the Third Proportional to 542.50 and 1,105

Step by Step Solution

1. Step 1: Write the proportion equation
   542.50 : 1,105 = 1,105 : x
2. Step 2: Convert to fraction form
   542.50/1,105 = 1,105/x
3. Step 3: Cross multiply
   542.50x = 1,105 × 1,105
4. Step 4: Simplify right side
   542.50x = 1,221,025
5. Step 5: Solve for x
   x = 1,221,025/542.50
6. Step 6: Final answer
   x = 2,250.74