Finding the Fourth Proportional to 142,558.20, 196,727.81 and 82,128.69

Step by Step Solution

1. Step 1: Write the proportion equation
   142,558.20 : 196,727.81 = 82,128.69 : x
2. Step 2: Convert to fraction form
   142,558.20/196,727.81 = 82,128.69/x
3. Step 3: Cross multiply
   142,558.20x = 196,727.81 × 82,128.69
4. Step 4: Simplify right side
   142,558.20x = 16,156,996,911.23
5. Step 5: Solve for x
   x = 16,156,996,911.23/142,558.20
6. Step 6: Final answer
   x = 113,336.15