Finding the Fourth Proportional to 139,400.38, 192,366.25 and 78,969.79

Step by Step Solution

1. Step 1: Write the proportion equation
   139,400.38 : 192,366.25 = 78,969.79 : x
2. Step 2: Convert to fraction form
   139,400.38/192,366.25 = 78,969.79/x
3. Step 3: Cross multiply
   139,400.38x = 192,366.25 × 78,969.79
4. Step 4: Simplify right side
   139,400.38x = 15,191,122,365.59
5. Step 5: Solve for x
   x = 15,191,122,365.59/139,400.38
6. Step 6: Final answer
   x = 108,974.76