Finding the Fourth Proportional to 139,371.98, 192,338.61 and 78,119.29

Step by Step Solution

1. Step 1: Write the proportion equation
   139,371.98 : 192,338.61 = 78,119.29 : x
2. Step 2: Convert to fraction form
   139,371.98/192,338.61 = 78,119.29/x
3. Step 3: Cross multiply
   139,371.98x = 192,338.61 × 78,119.29
4. Step 4: Simplify right side
   139,371.98x = 15,025,355,171.94
5. Step 5: Solve for x
   x = 15,025,355,171.94/139,371.98
6. Step 6: Final answer
   x = 107,807.58