Finding the Fourth Proportional to 139.29, 192.03 and 109.71

Step by Step Solution

1. Step 1: Write the proportion equation
   139.29 : 192.03 = 109.71 : x
2. Step 2: Convert to fraction form
   139.29/192.03 = 109.71/x
3. Step 3: Cross multiply
   139.29x = 192.03 × 109.71
4. Step 4: Simplify right side
   139.29x = 21,067.61
5. Step 5: Solve for x
   x = 21,067.61/139.29
6. Step 6: Final answer
   x = 151.25