Finding the Fourth Proportional to 139,399.38, 192,364.88 and 78,968.79

Step by Step Solution

1. Step 1: Write the proportion equation
   139,399.38 : 192,364.88 = 78,968.79 : x
2. Step 2: Convert to fraction form
   139,399.38/192,364.88 = 78,968.79/x
3. Step 3: Cross multiply
   139,399.38x = 192,364.88 × 78,968.79
4. Step 4: Simplify right side
   139,399.38x = 15,190,821,417.25
5. Step 5: Solve for x
   x = 15,190,821,417.25/139,399.38
6. Step 6: Final answer
   x = 108,973.38