Finding the Fourth Proportional to 123.38, 185.07 and 42.18

Step by Step Solution

1. Step 1: Write the proportion equation
   123.38 : 185.07 = 42.18 : x
2. Step 2: Convert to fraction form
   123.38/185.07 = 42.18/x
3. Step 3: Cross multiply
   123.38x = 185.07 × 42.18
4. Step 4: Simplify right side
   123.38x = 7,806.25
5. Step 5: Solve for x
   x = 7,806.25/123.38
6. Step 6: Final answer
   x = 63.27