Finding the Fourth Proportional to 121.69, 167.83 and 118.72

Step by Step Solution

1. Step 1: Write the proportion equation
   121.69 : 167.83 = 118.72 : x
2. Step 2: Convert to fraction form
   121.69/167.83 = 118.72/x
3. Step 3: Cross multiply
   121.69x = 167.83 × 118.72
4. Step 4: Simplify right side
   121.69x = 19,924.78
5. Step 5: Solve for x
   x = 19,924.78/121.69
6. Step 6: Final answer
   x = 163.73