Finding the Fourth Proportional to 123.49, 185.23 and 42.39

Step by Step Solution

1. Step 1: Write the proportion equation
   123.49 : 185.23 = 42.39 : x
2. Step 2: Convert to fraction form
   123.49/185.23 = 42.39/x
3. Step 3: Cross multiply
   123.49x = 185.23 × 42.39
4. Step 4: Simplify right side
   123.49x = 7,851.23
5. Step 5: Solve for x
   x = 7,851.23/123.49
6. Step 6: Final answer
   x = 63.58