Finding the Fourth Proportional to 142,494.80, 196,641.96 and 78,831.24

Step by Step Solution

1. Step 1: Write the proportion equation
   142,494.80 : 196,641.96 = 78,831.24 : x
2. Step 2: Convert to fraction form
   142,494.80/196,641.96 = 78,831.24/x
3. Step 3: Cross multiply
   142,494.80x = 196,641.96 × 78,831.24
4. Step 4: Simplify right side
   142,494.80x = 15,501,529,542.83
5. Step 5: Solve for x
   x = 15,501,529,542.83/142,494.80
6. Step 6: Final answer
   x = 108,786.63