Finding the Fourth Proportional to 139.72, 192.76 and 112

Step by Step Solution

1. Step 1: Write the proportion equation
   139.72 : 192.76 = 112 : x
2. Step 2: Convert to fraction form
   139.72/192.76 = 112/x
3. Step 3: Cross multiply
   139.72x = 192.76 × 112
4. Step 4: Simplify right side
   139.72x = 21,589.12
5. Step 5: Solve for x
   x = 21,589.12/139.72
6. Step 6: Final answer
   x = 154.52