Finding the Fourth Proportional to 123.96, 185.97 and 42.81

Step by Step Solution

1. Step 1: Write the proportion equation
   123.96 : 185.97 = 42.81 : x
2. Step 2: Convert to fraction form
   123.96/185.97 = 42.81/x
3. Step 3: Cross multiply
   123.96x = 185.97 × 42.81
4. Step 4: Simplify right side
   123.96x = 7,961.38
5. Step 5: Solve for x
   x = 7,961.38/123.96
6. Step 6: Final answer
   x = 64.23