Finding the Fourth Proportional to 123.97, 171.28 and 123.06

Step by Step Solution

1. Step 1: Write the proportion equation
   123.97 : 171.28 = 123.06 : x
2. Step 2: Convert to fraction form
   123.97/171.28 = 123.06/x
3. Step 3: Cross multiply
   123.97x = 171.28 × 123.06
4. Step 4: Simplify right side
   123.97x = 21,077.72
5. Step 5: Solve for x
   x = 21,077.72/123.97
6. Step 6: Final answer
   x = 170.02