Finding the Fourth Proportional to 142,107.78, 196,106.34 and 78,443.94

Step by Step Solution

1. Step 1: Write the proportion equation
   142,107.78 : 196,106.34 = 78,443.94 : x
2. Step 2: Convert to fraction form
   142,107.78/196,106.34 = 78,443.94/x
3. Step 3: Cross multiply
   142,107.78x = 196,106.34 × 78,443.94
4. Step 4: Simplify right side
   142,107.78x = 15,383,353,968.58
5. Step 5: Solve for x
   x = 15,383,353,968.58/142,107.78
6. Step 6: Final answer
   x = 108,251.31