Finding the Fourth Proportional to 294,624.57, 406,568.78 and 172,128.31

Step by Step Solution

1. Step 1: Write the proportion equation
   294,624.57 : 406,568.78 = 172,128.31 : x
2. Step 2: Convert to fraction form
   294,624.57/406,568.78 = 172,128.31/x
3. Step 3: Cross multiply
   294,624.57x = 406,568.78 × 172,128.31
4. Step 4: Simplify right side
   294,624.57x = 69,981,996,139.52
5. Step 5: Solve for x
   x = 69,981,996,139.52/294,624.57
6. Step 6: Final answer
   x = 237,529.40