Finding the Fourth Proportional to 88.77, 133.16 and 42.55

Step by Step Solution

1. Step 1: Write the proportion equation
   88.77 : 133.16 = 42.55 : x
2. Step 2: Convert to fraction form
   88.77/133.16 = 42.55/x
3. Step 3: Cross multiply
   88.77x = 133.16 × 42.55
4. Step 4: Simplify right side
   88.77x = 5,665.96
5. Step 5: Solve for x
   x = 5,665.96/88.77
6. Step 6: Final answer
   x = 63.83