Finding the Fourth Proportional to 74.89, 103.37 and 42.15

Step by Step Solution

1. Step 1: Write the proportion equation
   74.89 : 103.37 = 42.15 : x
2. Step 2: Convert to fraction form
   74.89/103.37 = 42.15/x
3. Step 3: Cross multiply
   74.89x = 103.37 × 42.15
4. Step 4: Simplify right side
   74.89x = 4,356.47
5. Step 5: Solve for x
   x = 4,356.47/74.89
6. Step 6: Final answer
   x = 58.17