Finding the Fourth Proportional to 42.42, 58.53 and 30.76

Step by Step Solution

1. Step 1: Write the proportion equation
   42.42 : 58.53 = 30.76 : x
2. Step 2: Convert to fraction form
   42.42/58.53 = 30.76/x
3. Step 3: Cross multiply
   42.42x = 58.53 × 30.76
4. Step 4: Simplify right side
   42.42x = 1,799.94
5. Step 5: Solve for x
   x = 1,799.94/42.42
6. Step 6: Final answer
   x = 42.43