Finding the Fourth Proportional to 142,705.40, 196,934.79 and 78,176.14

Step by Step Solution

1. Step 1: Write the proportion equation
   142,705.40 : 196,934.79 = 78,176.14 : x
2. Step 2: Convert to fraction form
   142,705.40/196,934.79 = 78,176.14/x
3. Step 3: Cross multiply
   142,705.40x = 196,934.79 × 78,176.14
4. Step 4: Simplify right side
   142,705.40x = 15,395,601,514.73
5. Step 5: Solve for x
   x = 15,395,601,514.73/142,705.40
6. Step 6: Final answer
   x = 107,883.81