Finding the Fourth Proportional to 123.39, 185.05 and 42.23

Step by Step Solution

1. Step 1: Write the proportion equation
   123.39 : 185.05 = 42.23 : x
2. Step 2: Convert to fraction form
   123.39/185.05 = 42.23/x
3. Step 3: Cross multiply
   123.39x = 185.05 × 42.23
4. Step 4: Simplify right side
   123.39x = 7,814.66
5. Step 5: Solve for x
   x = 7,814.66/123.39
6. Step 6: Final answer
   x = 63.33