Finding the Fourth Proportional to 90.37, 135.58 and 42.25

Step by Step Solution

1. Step 1: Write the proportion equation
   90.37 : 135.58 = 42.25 : x
2. Step 2: Convert to fraction form
   90.37/135.58 = 42.25/x
3. Step 3: Cross multiply
   90.37x = 135.58 × 42.25
4. Step 4: Simplify right side
   90.37x = 5,728.04
5. Step 5: Solve for x
   x = 5,728.04/90.37
6. Step 6: Final answer
   x = 63.38