Finding the Fourth Proportional to 57.82, 86.56 and 42.56

Step by Step Solution

1. Step 1: Write the proportion equation
   57.82 : 86.56 = 42.56 : x
2. Step 2: Convert to fraction form
   57.82/86.56 = 42.56/x
3. Step 3: Cross multiply
   57.82x = 86.56 × 42.56
4. Step 4: Simplify right side
   57.82x = 3,683.99
5. Step 5: Solve for x
   x = 3,683.99/57.82
6. Step 6: Final answer
   x = 63.71