Finding the Fourth Proportional to 139,399.88, 192,365.57 and 78,969.29

Step by Step Solution

1. Step 1: Write the proportion equation
   139,399.88 : 192,365.57 = 78,969.29 : x
2. Step 2: Convert to fraction form
   139,399.88/192,365.57 = 78,969.29/x
3. Step 3: Cross multiply
   139,399.88x = 192,365.57 × 78,969.29
4. Step 4: Simplify right side
   139,399.88x = 15,190,972,088.50
5. Step 5: Solve for x
   x = 15,190,972,088.50/139,399.88
6. Step 6: Final answer
   x = 108,974.07