Finding the Fourth Proportional to 20,205.36, 30,289.59 and 17,105.31

Step by Step Solution

1. Step 1: Write the proportion equation
   20,205.36 : 30,289.59 = 17,105.31 : x
2. Step 2: Convert to fraction form
   20,205.36/30,289.59 = 17,105.31/x
3. Step 3: Cross multiply
   20,205.36x = 30,289.59 × 17,105.31
4. Step 4: Simplify right side
   20,205.36x = 518,112,826.72
5. Step 5: Solve for x
   x = 518,112,826.72/20,205.36
6. Step 6: Final answer
   x = 25,642.35