Finding the Fourth Proportional to 139,741.86, 192,416.65 and 105,336.57

Step by Step Solution

1. Step 1: Write the proportion equation
   139,741.86 : 192,416.65 = 105,336.57 : x
2. Step 2: Convert to fraction form
   139,741.86/192,416.65 = 105,336.57/x
3. Step 3: Cross multiply
   139,741.86x = 192,416.65 × 105,336.57
4. Step 4: Simplify right side
   139,741.86x = 20,268,509,921.89
5. Step 5: Solve for x
   x = 20,268,509,921.89/139,741.86
6. Step 6: Final answer
   x = 145,042.51