Finding the Fourth Proportional to 258,411.57, 356,579.43 and 155,040.28

Step by Step Solution

1. Step 1: Write the proportion equation
   258,411.57 : 356,579.43 = 155,040.28 : x
2. Step 2: Convert to fraction form
   258,411.57/356,579.43 = 155,040.28/x
3. Step 3: Cross multiply
   258,411.57x = 356,579.43 × 155,040.28
4. Step 4: Simplify right side
   258,411.57x = 55,284,174,785.69
5. Step 5: Solve for x
   x = 55,284,174,785.69/258,411.57
6. Step 6: Final answer
   x = 213,938.47