Finding the Fourth Proportional to 139.05, 191.83 and 111.49

Step by Step Solution

1. Step 1: Write the proportion equation
   139.05 : 191.83 = 111.49 : x
2. Step 2: Convert to fraction form
   139.05/191.83 = 111.49/x
3. Step 3: Cross multiply
   139.05x = 191.83 × 111.49
4. Step 4: Simplify right side
   139.05x = 21,387.13
5. Step 5: Solve for x
   x = 21,387.13/139.05
6. Step 6: Final answer
   x = 153.81