Finding the Fourth Proportional to 90.94, 136.32 and 42.76

Step by Step Solution

1. Step 1: Write the proportion equation
   90.94 : 136.32 = 42.76 : x
2. Step 2: Convert to fraction form
   90.94/136.32 = 42.76/x
3. Step 3: Cross multiply
   90.94x = 136.32 × 42.76
4. Step 4: Simplify right side
   90.94x = 5,829.04
5. Step 5: Solve for x
   x = 5,829.04/90.94
6. Step 6: Final answer
   x = 64.10