Finding the Fourth Proportional to 90.84, 136.22 and 42.68

Step by Step Solution

1. Step 1: Write the proportion equation
   90.84 : 136.22 = 42.68 : x
2. Step 2: Convert to fraction form
   90.84/136.22 = 42.68/x
3. Step 3: Cross multiply
   90.84x = 136.22 × 42.68
4. Step 4: Simplify right side
   90.84x = 5,813.87
5. Step 5: Solve for x
   x = 5,813.87/90.84
6. Step 6: Final answer
   x = 64.00