Finding the Fourth Proportional to 142,238.80, 196,286.72 and 78,576

Step by Step Solution

1. Step 1: Write the proportion equation
   142,238.80 : 196,286.72 = 78,576 : x
2. Step 2: Convert to fraction form
   142,238.80/196,286.72 = 78,576/x
3. Step 3: Cross multiply
   142,238.80x = 196,286.72 × 78,576
4. Step 4: Simplify right side
   142,238.80x = 15,423,425,310.72
5. Step 5: Solve for x
   x = 15,423,425,310.72/142,238.80
6. Step 6: Final answer
   x = 108,433.32