Finding the Fourth Proportional to 90.52, 135.90 and 42.52

Step by Step Solution

1. Step 1: Write the proportion equation
   90.52 : 135.90 = 42.52 : x
2. Step 2: Convert to fraction form
   90.52/135.90 = 42.52/x
3. Step 3: Cross multiply
   90.52x = 135.90 × 42.52
4. Step 4: Simplify right side
   90.52x = 5,778.47
5. Step 5: Solve for x
   x = 5,778.47/90.52
6. Step 6: Final answer
   x = 63.84