Finding the Fourth Proportional to 43.56, 65.40 and 42.42

Step by Step Solution

1. Step 1: Write the proportion equation
   43.56 : 65.40 = 42.42 : x
2. Step 2: Convert to fraction form
   43.56/65.40 = 42.42/x
3. Step 3: Cross multiply
   43.56x = 65.40 × 42.42
4. Step 4: Simplify right side
   43.56x = 2,774.27
5. Step 5: Solve for x
   x = 2,774.27/43.56
6. Step 6: Final answer
   x = 63.69