Finding the Fourth Proportional to 142,373.69, 196,479.79 and 78,715.59

Step by Step Solution

1. Step 1: Write the proportion equation
   142,373.69 : 196,479.79 = 78,715.59 : x
2. Step 2: Convert to fraction form
   142,373.69/196,479.79 = 78,715.59/x
3. Step 3: Cross multiply
   142,373.69x = 196,479.79 × 78,715.59
4. Step 4: Simplify right side
   142,373.69x = 15,466,022,592.93
5. Step 5: Solve for x
   x = 15,466,022,592.93/142,373.69
6. Step 6: Final answer
   x = 108,629.78