Finding the Fourth Proportional to 142,149.15, 196,164.54 and 78,485.58

Step by Step Solution

1. Step 1: Write the proportion equation
   142,149.15 : 196,164.54 = 78,485.58 : x
2. Step 2: Convert to fraction form
   142,149.15/196,164.54 = 78,485.58/x
3. Step 3: Cross multiply
   142,149.15x = 196,164.54 × 78,485.58
4. Step 4: Simplify right side
   142,149.15x = 15,396,087,697.33
5. Step 5: Solve for x
   x = 15,396,087,697.33/142,149.15
6. Step 6: Final answer
   x = 108,309.39