Finding the Fourth Proportional to 139.48, 192.30 and 111.88

Step by Step Solution

1. Step 1: Write the proportion equation
   139.48 : 192.30 = 111.88 : x
2. Step 2: Convert to fraction form
   139.48/192.30 = 111.88/x
3. Step 3: Cross multiply
   139.48x = 192.30 × 111.88
4. Step 4: Simplify right side
   139.48x = 21,514.52
5. Step 5: Solve for x
   x = 21,514.52/139.48
6. Step 6: Final answer
   x = 154.25