Finding the Fourth Proportional to 111.84, 167.79 and 109.91

Step by Step Solution

1. Step 1: Write the proportion equation
   111.84 : 167.79 = 109.91 : x
2. Step 2: Convert to fraction form
   111.84/167.79 = 109.91/x
3. Step 3: Cross multiply
   111.84x = 167.79 × 109.91
4. Step 4: Simplify right side
   111.84x = 18,440.96
5. Step 5: Solve for x
   x = 18,440.96/111.84
6. Step 6: Final answer
   x = 164.89