Finding the Fourth Proportional to 142,168.10, 196,190.73 and 78,506.42

Step by Step Solution

1. Step 1: Write the proportion equation
   142,168.10 : 196,190.73 = 78,506.42 : x
2. Step 2: Convert to fraction form
   142,168.10/196,190.73 = 78,506.42/x
3. Step 3: Cross multiply
   142,168.10x = 196,190.73 × 78,506.42
4. Step 4: Simplify right side
   142,168.10x = 15,402,231,849.49
5. Step 5: Solve for x
   x = 15,402,231,849.49/142,168.10
6. Step 6: Final answer
   x = 108,338.17