Finding the Fourth Proportional to 139.47, 192.38 and 106.83

Step by Step Solution

1. Step 1: Write the proportion equation
   139.47 : 192.38 = 106.83 : x
2. Step 2: Convert to fraction form
   139.47/192.38 = 106.83/x
3. Step 3: Cross multiply
   139.47x = 192.38 × 106.83
4. Step 4: Simplify right side
   139.47x = 20,551.42
5. Step 5: Solve for x
   x = 20,551.42/139.47
6. Step 6: Final answer
   x = 147.35