Finding the Fourth Proportional to 142,399.72, 196,496.58 and 78,727.24

Step by Step Solution

1. Step 1: Write the proportion equation
   142,399.72 : 196,496.58 = 78,727.24 : x
2. Step 2: Convert to fraction form
   142,399.72/196,496.58 = 78,727.24/x
3. Step 3: Cross multiply
   142,399.72x = 196,496.58 × 78,727.24
4. Step 4: Simplify right side
   142,399.72x = 15,469,633,412.84
5. Step 5: Solve for x
   x = 15,469,633,412.84/142,399.72
6. Step 6: Final answer
   x = 108,635.28