Finding the Third Proportional to 113.20 and 123.05

Step by Step Solution

1. Step 1: Write the proportion equation
   113.20 : 123.05 = 123.05 : x
2. Step 2: Convert to fraction form
   113.20/123.05 = 123.05/x
3. Step 3: Cross multiply
   113.20x = 123.05 × 123.05
4. Step 4: Simplify right side
   113.20x = 15,140.53
5. Step 5: Solve for x
   x = 15,140.53/113.20
6. Step 6: Final answer
   x = 133.75