Finding the Fourth Proportional to 142,449.69, 196,568.31 and 78,771.54

Step by Step Solution

1. Step 1: Write the proportion equation
   142,449.69 : 196,568.31 = 78,771.54 : x
2. Step 2: Convert to fraction form
   142,449.69/196,568.31 = 78,771.54/x
3. Step 3: Cross multiply
   142,449.69x = 196,568.31 × 78,771.54
4. Step 4: Simplify right side
   142,449.69x = 15,483,988,493.90
5. Step 5: Solve for x
   x = 15,483,988,493.90/142,449.69
6. Step 6: Final answer
   x = 108,697.94