Finding the Fourth Proportional to 90.93, 136.38 and 42.17

Step by Step Solution

1. Step 1: Write the proportion equation
   90.93 : 136.38 = 42.17 : x
2. Step 2: Convert to fraction form
   90.93/136.38 = 42.17/x
3. Step 3: Cross multiply
   90.93x = 136.38 × 42.17
4. Step 4: Simplify right side
   90.93x = 5,751.14
5. Step 5: Solve for x
   x = 5,751.14/90.93
6. Step 6: Final answer
   x = 63.25