Finding the Fourth Proportional to 139.36, 192.23 and 111.69

Step by Step Solution

1. Step 1: Write the proportion equation
   139.36 : 192.23 = 111.69 : x
2. Step 2: Convert to fraction form
   139.36/192.23 = 111.69/x
3. Step 3: Cross multiply
   139.36x = 192.23 × 111.69
4. Step 4: Simplify right side
   139.36x = 21,470.17
5. Step 5: Solve for x
   x = 21,470.17/139.36
6. Step 6: Final answer
   x = 154.06