Finding the Fourth Proportional to 139,196.88, 192,103.65 and 78,786.81

Step by Step Solution

1. Step 1: Write the proportion equation
   139,196.88 : 192,103.65 = 78,786.81 : x
2. Step 2: Convert to fraction form
   139,196.88/192,103.65 = 78,786.81/x
3. Step 3: Cross multiply
   139,196.88x = 192,103.65 × 78,786.81
4. Step 4: Simplify right side
   139,196.88x = 15,135,233,772.86
5. Step 5: Solve for x
   x = 15,135,233,772.86/139,196.88
6. Step 6: Final answer
   x = 108,732.56