Finding the Fourth Proportional to 123.35, 185.04 and 42.18

Step by Step Solution

1. Step 1: Write the proportion equation
   123.35 : 185.04 = 42.18 : x
2. Step 2: Convert to fraction form
   123.35/185.04 = 42.18/x
3. Step 3: Cross multiply
   123.35x = 185.04 × 42.18
4. Step 4: Simplify right side
   123.35x = 7,804.99
5. Step 5: Solve for x
   x = 7,804.99/123.35
6. Step 6: Final answer
   x = 63.28