Finding the Fourth Proportional to 139.37, 192.42 and 106.56

Step by Step Solution

1. Step 1: Write the proportion equation
   139.37 : 192.42 = 106.56 : x
2. Step 2: Convert to fraction form
   139.37/192.42 = 106.56/x
3. Step 3: Cross multiply
   139.37x = 192.42 × 106.56
4. Step 4: Simplify right side
   139.37x = 20,504.28
5. Step 5: Solve for x
   x = 20,504.28/139.37
6. Step 6: Final answer
   x = 147.13