Finding the Fourth Proportional to 139.82, 192.96 and 80.82

Step by Step Solution

1. Step 1: Write the proportion equation
   139.82 : 192.96 = 80.82 : x
2. Step 2: Convert to fraction form
   139.82/192.96 = 80.82/x
3. Step 3: Cross multiply
   139.82x = 192.96 × 80.82
4. Step 4: Simplify right side
   139.82x = 15,595.03
5. Step 5: Solve for x
   x = 15,595.03/139.82
6. Step 6: Final answer
   x = 111.54