Finding the Fourth Proportional to 111.94, 168.08 and 91.76

Step by Step Solution

1. Step 1: Write the proportion equation
   111.94 : 168.08 = 91.76 : x
2. Step 2: Convert to fraction form
   111.94/168.08 = 91.76/x
3. Step 3: Cross multiply
   111.94x = 168.08 × 91.76
4. Step 4: Simplify right side
   111.94x = 15,421.72
5. Step 5: Solve for x
   x = 15,421.72/111.94
6. Step 6: Final answer
   x = 137.77