Finding the Fourth Proportional to 142,388.62, 196,500.23 and 78,728.69

Step by Step Solution

1. Step 1: Write the proportion equation
   142,388.62 : 196,500.23 = 78,728.69 : x
2. Step 2: Convert to fraction form
   142,388.62/196,500.23 = 78,728.69/x
3. Step 3: Cross multiply
   142,388.62x = 196,500.23 × 78,728.69
4. Step 4: Simplify right side
   142,388.62x = 15,470,206,085.44
5. Step 5: Solve for x
   x = 15,470,206,085.44/142,388.62
6. Step 6: Final answer
   x = 108,647.77