Finding the Fourth Proportional to 192.72, 288.72 and 111.36

Step by Step Solution

1. Step 1: Write the proportion equation
   192.72 : 288.72 = 111.36 : x
2. Step 2: Convert to fraction form
   192.72/288.72 = 111.36/x
3. Step 3: Cross multiply
   192.72x = 288.72 × 111.36
4. Step 4: Simplify right side
   192.72x = 32,151.86
5. Step 5: Solve for x
   x = 32,151.86/192.72
6. Step 6: Final answer
   x = 166.83