Finding the Fourth Proportional to 139.08, 191.82 and 111.42

Step by Step Solution

1. Step 1: Write the proportion equation
   139.08 : 191.82 = 111.42 : x
2. Step 2: Convert to fraction form
   139.08/191.82 = 111.42/x
3. Step 3: Cross multiply
   139.08x = 191.82 × 111.42
4. Step 4: Simplify right side
   139.08x = 21,372.58
5. Step 5: Solve for x
   x = 21,372.58/139.08
6. Step 6: Final answer
   x = 153.67