Finding the Fourth Proportional to 139.57, 192.71 and 112.09

Step by Step Solution

1. Step 1: Write the proportion equation
   139.57 : 192.71 = 112.09 : x
2. Step 2: Convert to fraction form
   139.57/192.71 = 112.09/x
3. Step 3: Cross multiply
   139.57x = 192.71 × 112.09
4. Step 4: Simplify right side
   139.57x = 21,600.86
5. Step 5: Solve for x
   x = 21,600.86/139.57
6. Step 6: Final answer
   x = 154.77