Finding the Fourth Proportional to 142,789.68, 197,047.40 and 78,258.42

Step by Step Solution

1. Step 1: Write the proportion equation
   142,789.68 : 197,047.40 = 78,258.42 : x
2. Step 2: Convert to fraction form
   142,789.68/197,047.40 = 78,258.42/x
3. Step 3: Cross multiply
   142,789.68x = 197,047.40 × 78,258.42
4. Step 4: Simplify right side
   142,789.68x = 15,420,618,189.11
5. Step 5: Solve for x
   x = 15,420,618,189.11/142,789.68
6. Step 6: Final answer
   x = 107,995.33