Finding the Fourth Proportional to 142,105.29, 196,105.56 and 78,443.13

Step by Step Solution

1. Step 1: Write the proportion equation
   142,105.29 : 196,105.56 = 78,443.13 : x
2. Step 2: Convert to fraction form
   142,105.29/196,105.56 = 78,443.13/x
3. Step 3: Cross multiply
   142,105.29x = 196,105.56 × 78,443.13
4. Step 4: Simplify right side
   142,105.29x = 15,383,134,378.04
5. Step 5: Solve for x
   x = 15,383,134,378.04/142,105.29
6. Step 6: Final answer
   x = 108,251.67