Finding the Fourth Proportional to 90.92, 136.38 and 42.16

Step by Step Solution

1. Step 1: Write the proportion equation
   90.92 : 136.38 = 42.16 : x
2. Step 2: Convert to fraction form
   90.92/136.38 = 42.16/x
3. Step 3: Cross multiply
   90.92x = 136.38 × 42.16
4. Step 4: Simplify right side
   90.92x = 5,749.78
5. Step 5: Solve for x
   x = 5,749.78/90.92
6. Step 6: Final answer
   x = 63.24