Finding the Fourth Proportional to 42.72, 58.89 and 34.56

Step by Step Solution

1. Step 1: Write the proportion equation
   42.72 : 58.89 = 34.56 : x
2. Step 2: Convert to fraction form
   42.72/58.89 = 34.56/x
3. Step 3: Cross multiply
   42.72x = 58.89 × 34.56
4. Step 4: Simplify right side
   42.72x = 2,035.24
5. Step 5: Solve for x
   x = 2,035.24/42.72
6. Step 6: Final answer
   x = 47.64