Finding the Fourth Proportional to 142,151.56, 196,171.68 and 78,485.56

Step by Step Solution

1. Step 1: Write the proportion equation
   142,151.56 : 196,171.68 = 78,485.56 : x
2. Step 2: Convert to fraction form
   142,151.56/196,171.68 = 78,485.56/x
3. Step 3: Cross multiply
   142,151.56x = 196,171.68 × 78,485.56
4. Step 4: Simplify right side
   142,151.56x = 15,396,644,160.94
5. Step 5: Solve for x
   x = 15,396,644,160.94/142,151.56
6. Step 6: Final answer
   x = 108,311.47