Finding the Fourth Proportional to 139.41, 192.30 and 123.08

Step by Step Solution

1. Step 1: Write the proportion equation
   139.41 : 192.30 = 123.08 : x
2. Step 2: Convert to fraction form
   139.41/192.30 = 123.08/x
3. Step 3: Cross multiply
   139.41x = 192.30 × 123.08
4. Step 4: Simplify right side
   139.41x = 23,667.32
5. Step 5: Solve for x
   x = 23,667.32/139.41
6. Step 6: Final answer
   x = 169.77