Finding the Fourth Proportional to 139,716.33, 192,381.56 and 105,311.05

Step by Step Solution

1. Step 1: Write the proportion equation
   139,716.33 : 192,381.56 = 105,311.05 : x
2. Step 2: Convert to fraction form
   139,716.33/192,381.56 = 105,311.05/x
3. Step 3: Cross multiply
   139,716.33x = 192,381.56 × 105,311.05
4. Step 4: Simplify right side
   139,716.33x = 20,259,904,553.79
5. Step 5: Solve for x
   x = 20,259,904,553.79/139,716.33
6. Step 6: Final answer
   x = 145,007.42