Finding the Fourth Proportional to 139.72, 192.89 and 124.34

Step by Step Solution

1. Step 1: Write the proportion equation
   139.72 : 192.89 = 124.34 : x
2. Step 2: Convert to fraction form
   139.72/192.89 = 124.34/x
3. Step 3: Cross multiply
   139.72x = 192.89 × 124.34
4. Step 4: Simplify right side
   139.72x = 23,983.94
5. Step 5: Solve for x
   x = 23,983.94/139.72
6. Step 6: Final answer
   x = 171.66