Finding the Fourth Proportional to 139,721.34, 192,388.46 and 105,316.06

Step by Step Solution

1. Step 1: Write the proportion equation
   139,721.34 : 192,388.46 = 105,316.06 : x
2. Step 2: Convert to fraction form
   139,721.34/192,388.46 = 105,316.06/x
3. Step 3: Cross multiply
   139,721.34x = 192,388.46 × 105,316.06
4. Step 4: Simplify right side
   139,721.34x = 20,261,594,596.67
5. Step 5: Solve for x
   x = 20,261,594,596.67/139,721.34
6. Step 6: Final answer
   x = 145,014.32