Finding the Fourth Proportional to 52.42, 72.28 and 42.02

Step by Step Solution

1. Step 1: Write the proportion equation
   52.42 : 72.28 = 42.02 : x
2. Step 2: Convert to fraction form
   52.42/72.28 = 42.02/x
3. Step 3: Cross multiply
   52.42x = 72.28 × 42.02
4. Step 4: Simplify right side
   52.42x = 3,037.21
5. Step 5: Solve for x
   x = 3,037.21/52.42
6. Step 6: Final answer
   x = 57.94