Finding the Fourth Proportional to 142,357.68, 196,436.34 and 78,686.64

Step by Step Solution

1. Step 1: Write the proportion equation
   142,357.68 : 196,436.34 = 78,686.64 : x
2. Step 2: Convert to fraction form
   142,357.68/196,436.34 = 78,686.64/x
3. Step 3: Cross multiply
   142,357.68x = 196,436.34 × 78,686.64
4. Step 4: Simplify right side
   142,357.68x = 15,456,915,568.50
5. Step 5: Solve for x
   x = 15,456,915,568.50/142,357.68
6. Step 6: Final answer
   x = 108,578.02