Finding the Fourth Proportional to 139.43, 192.56 and 106.89

Step by Step Solution

1. Step 1: Write the proportion equation
   139.43 : 192.56 = 106.89 : x
2. Step 2: Convert to fraction form
   139.43/192.56 = 106.89/x
3. Step 3: Cross multiply
   139.43x = 192.56 × 106.89
4. Step 4: Simplify right side
   139.43x = 20,582.20
5. Step 5: Solve for x
   x = 20,582.20/139.43
6. Step 6: Final answer
   x = 147.62