Finding the Fourth Proportional to 309,111.12, 426,568.38 and 173,144.76

Step by Step Solution

1. Step 1: Write the proportion equation
   309,111.12 : 426,568.38 = 173,144.76 : x
2. Step 2: Convert to fraction form
   309,111.12/426,568.38 = 173,144.76/x
3. Step 3: Cross multiply
   309,111.12x = 426,568.38 × 173,144.76
4. Step 4: Simplify right side
   309,111.12x = 73,858,079,778.69
5. Step 5: Solve for x
   x = 73,858,079,778.69/309,111.12
6. Step 6: Final answer
   x = 238,936.99