Finding the Fourth Proportional to 90.54, 135.69 and 42.36

Step by Step Solution

1. Step 1: Write the proportion equation
   90.54 : 135.69 = 42.36 : x
2. Step 2: Convert to fraction form
   90.54/135.69 = 42.36/x
3. Step 3: Cross multiply
   90.54x = 135.69 × 42.36
4. Step 4: Simplify right side
   90.54x = 5,747.83
5. Step 5: Solve for x
   x = 5,747.83/90.54
6. Step 6: Final answer
   x = 63.48