Finding the Fourth Proportional to 139,667.72, 192,745.83 and 79,240.91

Step by Step Solution

1. Step 1: Write the proportion equation
   139,667.72 : 192,745.83 = 79,240.91 : x
2. Step 2: Convert to fraction form
   139,667.72/192,745.83 = 79,240.91/x
3. Step 3: Cross multiply
   139,667.72x = 192,745.83 × 79,240.91
4. Step 4: Simplify right side
   139,667.72x = 15,273,354,571.70
5. Step 5: Solve for x
   x = 15,273,354,571.70/139,667.72
6. Step 6: Final answer
   x = 109,354.94