Finding the Fourth Proportional to 88.36, 132.49 and 42.78

Step by Step Solution

1. Step 1: Write the proportion equation
   88.36 : 132.49 = 42.78 : x
2. Step 2: Convert to fraction form
   88.36/132.49 = 42.78/x
3. Step 3: Cross multiply
   88.36x = 132.49 × 42.78
4. Step 4: Simplify right side
   88.36x = 5,667.49
5. Step 5: Solve for x
   x = 5,667.49/88.36
6. Step 6: Final answer
   x = 64.14