Finding the Fourth Proportional to 56.72, 78.42 and 42.14

Step by Step Solution

1. Step 1: Write the proportion equation
   56.72 : 78.42 = 42.14 : x
2. Step 2: Convert to fraction form
   56.72/78.42 = 42.14/x
3. Step 3: Cross multiply
   56.72x = 78.42 × 42.14
4. Step 4: Simplify right side
   56.72x = 3,304.23
5. Step 5: Solve for x
   x = 3,304.23/56.72
6. Step 6: Final answer
   x = 58.26