Finding the Fourth Proportional to 210,426.52, 315,790.64 and 142,789.88

Step by Step Solution

1. Step 1: Write the proportion equation
   210,426.52 : 315,790.64 = 142,789.88 : x
2. Step 2: Convert to fraction form
   210,426.52/315,790.64 = 142,789.88/x
3. Step 3: Cross multiply
   210,426.52x = 315,790.64 × 142,789.88
4. Step 4: Simplify right side
   210,426.52x = 45,091,707,590.72
5. Step 5: Solve for x
   x = 45,091,707,590.72/210,426.52
6. Step 6: Final answer
   x = 214,287.19