Finding the Fourth Proportional to 139,339.49, 192,290.69 and 78,908.49

Step by Step Solution

1. Step 1: Write the proportion equation
   139,339.49 : 192,290.69 = 78,908.49 : x
2. Step 2: Convert to fraction form
   139,339.49/192,290.69 = 78,908.49/x
3. Step 3: Cross multiply
   139,339.49x = 192,290.69 × 78,908.49
4. Step 4: Simplify right side
   139,339.49x = 15,173,368,186.23
5. Step 5: Solve for x
   x = 15,173,368,186.23/139,339.49
6. Step 6: Final answer
   x = 108,894.96