Finding the Fourth Proportional to 142,831.82, 197,109.89 and 78,307.12

Step by Step Solution

1. Step 1: Write the proportion equation
   142,831.82 : 197,109.89 = 78,307.12 : x
2. Step 2: Convert to fraction form
   142,831.82/197,109.89 = 78,307.12/x
3. Step 3: Cross multiply
   142,831.82x = 197,109.89 × 78,307.12
4. Step 4: Simplify right side
   142,831.82x = 15,435,107,809.42
5. Step 5: Solve for x
   x = 15,435,107,809.42/142,831.82
6. Step 6: Final answer
   x = 108,064.91