Finding the Fourth Proportional to 139.86, 192.86 and 120.25

Step by Step Solution

1. Step 1: Write the proportion equation
   139.86 : 192.86 = 120.25 : x
2. Step 2: Convert to fraction form
   139.86/192.86 = 120.25/x
3. Step 3: Cross multiply
   139.86x = 192.86 × 120.25
4. Step 4: Simplify right side
   139.86x = 23,190.81
5. Step 5: Solve for x
   x = 23,190.81/139.86
6. Step 6: Final answer
   x = 165.82