Finding the Fourth Proportional to 142,291.79, 196,362.74 and 78,629.59

Step by Step Solution

1. Step 1: Write the proportion equation
   142,291.79 : 196,362.74 = 78,629.59 : x
2. Step 2: Convert to fraction form
   142,291.79/196,362.74 = 78,629.59/x
3. Step 3: Cross multiply
   142,291.79x = 196,362.74 × 78,629.59
4. Step 4: Simplify right side
   142,291.79x = 15,439,921,443.14
5. Step 5: Solve for x
   x = 15,439,921,443.14/142,291.79
6. Step 6: Final answer
   x = 108,508.87