Finding the Fourth Proportional to 50.42, 69.54 and 42.16

Step by Step Solution

1. Step 1: Write the proportion equation
   50.42 : 69.54 = 42.16 : x
2. Step 2: Convert to fraction form
   50.42/69.54 = 42.16/x
3. Step 3: Cross multiply
   50.42x = 69.54 × 42.16
4. Step 4: Simplify right side
   50.42x = 2,931.63
5. Step 5: Solve for x
   x = 2,931.63/50.42
6. Step 6: Final answer
   x = 58.15