Finding the Fourth Proportional to 90.47, 135.76 and 42.38

Step by Step Solution

1. Step 1: Write the proportion equation
   90.47 : 135.76 = 42.38 : x
2. Step 2: Convert to fraction form
   90.47/135.76 = 42.38/x
3. Step 3: Cross multiply
   90.47x = 135.76 × 42.38
4. Step 4: Simplify right side
   90.47x = 5,752.72
5. Step 5: Solve for x
   x = 5,752.72/90.47
6. Step 6: Final answer
   x = 63.59