Finding the Fourth Proportional to 90.94, 136.29 and 42.19

Step by Step Solution

1. Step 1: Write the proportion equation
   90.94 : 136.29 = 42.19 : x
2. Step 2: Convert to fraction form
   90.94/136.29 = 42.19/x
3. Step 3: Cross multiply
   90.94x = 136.29 × 42.19
4. Step 4: Simplify right side
   90.94x = 5,749.50
5. Step 5: Solve for x
   x = 5,749.50/90.94
6. Step 6: Final answer
   x = 63.22