Finding the Fourth Proportional to 142,447.32, 196,571.79 and 78,786.18

Step by Step Solution

1. Step 1: Write the proportion equation
   142,447.32 : 196,571.79 = 78,786.18 : x
2. Step 2: Convert to fraction form
   142,447.32/196,571.79 = 78,786.18/x
3. Step 3: Cross multiply
   142,447.32x = 196,571.79 × 78,786.18
4. Step 4: Simplify right side
   142,447.32x = 15,487,140,429.86
5. Step 5: Solve for x
   x = 15,487,140,429.86/142,447.32
6. Step 6: Final answer
   x = 108,721.88