Finding the Fourth Proportional to 139.49, 192.37 and 111.85

Step by Step Solution

1. Step 1: Write the proportion equation
   139.49 : 192.37 = 111.85 : x
2. Step 2: Convert to fraction form
   139.49/192.37 = 111.85/x
3. Step 3: Cross multiply
   139.49x = 192.37 × 111.85
4. Step 4: Simplify right side
   139.49x = 21,516.58
5. Step 5: Solve for x
   x = 21,516.58/139.49
6. Step 6: Final answer
   x = 154.25