Finding the Fourth Proportional to 139,678.50, 192,722.72 and 82,320.11

Step by Step Solution

1. Step 1: Write the proportion equation
   139,678.50 : 192,722.72 = 82,320.11 : x
2. Step 2: Convert to fraction form
   139,678.50/192,722.72 = 82,320.11/x
3. Step 3: Cross multiply
   139,678.50x = 192,722.72 × 82,320.11
4. Step 4: Simplify right side
   139,678.50x = 15,864,954,134.69
5. Step 5: Solve for x
   x = 15,864,954,134.69/139,678.50
6. Step 6: Final answer
   x = 113,581.93