Finding the Fourth Proportional to 139,488.94, 192,515.79 and 85,072.69

Step by Step Solution

1. Step 1: Write the proportion equation
   139,488.94 : 192,515.79 = 85,072.69 : x
2. Step 2: Convert to fraction form
   139,488.94/192,515.79 = 85,072.69/x
3. Step 3: Cross multiply
   139,488.94x = 192,515.79 × 85,072.69
4. Step 4: Simplify right side
   139,488.94x = 16,377,836,122.78
5. Step 5: Solve for x
   x = 16,377,836,122.78/139,488.94
6. Step 6: Final answer
   x = 117,413.15