Finding the Fourth Proportional to 111.98, 169.02 and 107.72

Step by Step Solution

1. Step 1: Write the proportion equation
   111.98 : 169.02 = 107.72 : x
2. Step 2: Convert to fraction form
   111.98/169.02 = 107.72/x
3. Step 3: Cross multiply
   111.98x = 169.02 × 107.72
4. Step 4: Simplify right side
   111.98x = 18,206.83
5. Step 5: Solve for x
   x = 18,206.83/111.98
6. Step 6: Final answer
   x = 162.59