Finding the Fourth Proportional to 123.15, 169.82 and 105.62

Step by Step Solution

1. Step 1: Write the proportion equation
   123.15 : 169.82 = 105.62 : x
2. Step 2: Convert to fraction form
   123.15/169.82 = 105.62/x
3. Step 3: Cross multiply
   123.15x = 169.82 × 105.62
4. Step 4: Simplify right side
   123.15x = 17,935.01
5. Step 5: Solve for x
   x = 17,935.01/123.15
6. Step 6: Final answer
   x = 145.64