Finding the Fourth Proportional to 139.27, 191.94 and 111.73

Step by Step Solution

1. Step 1: Write the proportion equation
   139.27 : 191.94 = 111.73 : x
2. Step 2: Convert to fraction form
   139.27/191.94 = 111.73/x
3. Step 3: Cross multiply
   139.27x = 191.94 × 111.73
4. Step 4: Simplify right side
   139.27x = 21,445.46
5. Step 5: Solve for x
   x = 21,445.46/139.27
6. Step 6: Final answer
   x = 153.98