Finding the Fourth Proportional to 142,747.20, 196,992.72 and 79,086

Step by Step Solution

1. Step 1: Write the proportion equation
   142,747.20 : 196,992.72 = 79,086 : x
2. Step 2: Convert to fraction form
   142,747.20/196,992.72 = 79,086/x
3. Step 3: Cross multiply
   142,747.20x = 196,992.72 × 79,086
4. Step 4: Simplify right side
   142,747.20x = 15,579,366,253.92
5. Step 5: Solve for x
   x = 15,579,366,253.92/142,747.20
6. Step 6: Final answer
   x = 109,139.56