Finding the Fourth Proportional to 139.10, 192.11 and 123.83

Step by Step Solution

1. Step 1: Write the proportion equation
   139.10 : 192.11 = 123.83 : x
2. Step 2: Convert to fraction form
   139.10/192.11 = 123.83/x
3. Step 3: Cross multiply
   139.10x = 192.11 × 123.83
4. Step 4: Simplify right side
   139.10x = 23,789.46
5. Step 5: Solve for x
   x = 23,789.46/139.10
6. Step 6: Final answer
   x = 171.02