Finding the Fourth Proportional to 90.42, 135.69 and 42.33

Step by Step Solution

1. Step 1: Write the proportion equation
   90.42 : 135.69 = 42.33 : x
2. Step 2: Convert to fraction form
   90.42/135.69 = 42.33/x
3. Step 3: Cross multiply
   90.42x = 135.69 × 42.33
4. Step 4: Simplify right side
   90.42x = 5,743.60
5. Step 5: Solve for x
   x = 5,743.60/90.42
6. Step 6: Final answer
   x = 63.52