Finding the Fourth Proportional to 142,789.60, 213,979.60 and 105,055.20

Step by Step Solution

1. Step 1: Write the proportion equation
   142,789.60 : 213,979.60 = 105,055.20 : x
2. Step 2: Convert to fraction form
   142,789.60/213,979.60 = 105,055.20/x
3. Step 3: Cross multiply
   142,789.60x = 213,979.60 × 105,055.20
4. Step 4: Simplify right side
   142,789.60x = 22,479,669,673.92
5. Step 5: Solve for x
   x = 22,479,669,673.92/142,789.60
6. Step 6: Final answer
   x = 157,432.12