Finding the Fourth Proportional to 142,494.69, 196,631.83 and 78,831.12

Step by Step Solution

1. Step 1: Write the proportion equation
   142,494.69 : 196,631.83 = 78,831.12 : x
2. Step 2: Convert to fraction form
   142,494.69/196,631.83 = 78,831.12/x
3. Step 3: Cross multiply
   142,494.69x = 196,631.83 × 78,831.12
4. Step 4: Simplify right side
   142,494.69x = 15,500,707,386.55
5. Step 5: Solve for x
   x = 15,500,707,386.55/142,494.69
6. Step 6: Final answer
   x = 108,780.95