Finding the Fourth Proportional to 139,323.38, 192,267 and 78,905.79

Step by Step Solution

1. Step 1: Write the proportion equation
   139,323.38 : 192,267 = 78,905.79 : x
2. Step 2: Convert to fraction form
   139,323.38/192,267 = 78,905.79/x
3. Step 3: Cross multiply
   139,323.38x = 192,267 × 78,905.79
4. Step 4: Simplify right side
   139,323.38x = 15,170,979,525.93
5. Step 5: Solve for x
   x = 15,170,979,525.93/139,323.38
6. Step 6: Final answer
   x = 108,890.41