Finding the Fourth Proportional to 74.58, 111.78 and 42.09

Step by Step Solution

1. Step 1: Write the proportion equation
   74.58 : 111.78 = 42.09 : x
2. Step 2: Convert to fraction form
   74.58/111.78 = 42.09/x
3. Step 3: Cross multiply
   74.58x = 111.78 × 42.09
4. Step 4: Simplify right side
   74.58x = 4,704.82
5. Step 5: Solve for x
   x = 4,704.82/74.58
6. Step 6: Final answer
   x = 63.08