Finding the Fourth Proportional to 142,378.72, 196,472.88 and 78,715.92

Step by Step Solution

1. Step 1: Write the proportion equation
   142,378.72 : 196,472.88 = 78,715.92 : x
2. Step 2: Convert to fraction form
   142,378.72/196,472.88 = 78,715.92/x
3. Step 3: Cross multiply
   142,378.72x = 196,472.88 × 78,715.92
4. Step 4: Simplify right side
   142,378.72x = 15,465,543,504.25
5. Step 5: Solve for x
   x = 15,465,543,504.25/142,378.72
6. Step 6: Final answer
   x = 108,622.58