Finding the Fourth Proportional to 139.42, 192.83 and 124.86

Step by Step Solution

1. Step 1: Write the proportion equation
   139.42 : 192.83 = 124.86 : x
2. Step 2: Convert to fraction form
   139.42/192.83 = 124.86/x
3. Step 3: Cross multiply
   139.42x = 192.83 × 124.86
4. Step 4: Simplify right side
   139.42x = 24,076.75
5. Step 5: Solve for x
   x = 24,076.75/139.42
6. Step 6: Final answer
   x = 172.69