Finding the Fourth Proportional to 139,725, 192,393.52 and 105,319.76

Step by Step Solution

1. Step 1: Write the proportion equation
   139,725 : 192,393.52 = 105,319.76 : x
2. Step 2: Convert to fraction form
   139,725/192,393.52 = 105,319.76/x
3. Step 3: Cross multiply
   139,725x = 192,393.52 × 105,319.76
4. Step 4: Simplify right side
   139,725x = 20,262,839,351.96
5. Step 5: Solve for x
   x = 20,262,839,351.96/139,725
6. Step 6: Final answer
   x = 145,019.43