Finding the Fourth Proportional to 309,411.21, 426,979.76 and 171,589.33

Step by Step Solution

1. Step 1: Write the proportion equation
   309,411.21 : 426,979.76 = 171,589.33 : x
2. Step 2: Convert to fraction form
   309,411.21/426,979.76 = 171,589.33/x
3. Step 3: Cross multiply
   309,411.21x = 426,979.76 × 171,589.33
4. Step 4: Simplify right side
   309,411.21x = 73,265,170,084.01
5. Step 5: Solve for x
   x = 73,265,170,084.01/309,411.21
6. Step 6: Final answer
   x = 236,789.00