Finding the Fourth Proportional to 139,386.84, 192,339.96 and 78,945.42

Step by Step Solution

1. Step 1: Write the proportion equation
   139,386.84 : 192,339.96 = 78,945.42 : x
2. Step 2: Convert to fraction form
   139,386.84/192,339.96 = 78,945.42/x
3. Step 3: Cross multiply
   139,386.84x = 192,339.96 × 78,945.42
4. Step 4: Simplify right side
   139,386.84x = 15,184,358,924.98
5. Step 5: Solve for x
   x = 15,184,358,924.98/139,386.84
6. Step 6: Final answer
   x = 108,936.82