Finding the Fourth Proportional to 139.04, 191.82 and 80.82

Step by Step Solution

1. Step 1: Write the proportion equation
   139.04 : 191.82 = 80.82 : x
2. Step 2: Convert to fraction form
   139.04/191.82 = 80.82/x
3. Step 3: Cross multiply
   139.04x = 191.82 × 80.82
4. Step 4: Simplify right side
   139.04x = 15,502.89
5. Step 5: Solve for x
   x = 15,502.89/139.04
6. Step 6: Final answer
   x = 111.50