Finding the Fourth Proportional to 142,556.72, 196,711.04 and 78,890.72

Step by Step Solution

1. Step 1: Write the proportion equation
   142,556.72 : 196,711.04 = 78,890.72 : x
2. Step 2: Convert to fraction form
   142,556.72/196,711.04 = 78,890.72/x
3. Step 3: Cross multiply
   142,556.72x = 196,711.04 × 78,890.72
4. Step 4: Simplify right side
   142,556.72x = 15,518,675,577.55
5. Step 5: Solve for x
   x = 15,518,675,577.55/142,556.72
6. Step 6: Final answer
   x = 108,859.66