Finding the Fourth Proportional to 123.93, 171.06 and 105.50

Step by Step Solution

1. Step 1: Write the proportion equation
   123.93 : 171.06 = 105.50 : x
2. Step 2: Convert to fraction form
   123.93/171.06 = 105.50/x
3. Step 3: Cross multiply
   123.93x = 171.06 × 105.50
4. Step 4: Simplify right side
   123.93x = 18,047.46
5. Step 5: Solve for x
   x = 18,047.46/123.93
6. Step 6: Final answer
   x = 145.63