Finding the Fourth Proportional to 123.10, 166.28 and 123.10

Step by Step Solution

1. Step 1: Write the proportion equation
   123.10 : 166.28 = 123.10 : x
2. Step 2: Convert to fraction form
   123.10/166.28 = 123.10/x
3. Step 3: Cross multiply
   123.10x = 166.28 × 123.10
4. Step 4: Simplify right side
   123.10x = 20,469.07
5. Step 5: Solve for x
   x = 20,469.07/123.10
6. Step 6: Final answer
   x = 166.28