Finding the Fourth Proportional to 22,435.20, 30,960.42 and 13,009.20

Step by Step Solution

1. Step 1: Write the proportion equation
   22,435.20 : 30,960.42 = 13,009.20 : x
2. Step 2: Convert to fraction form
   22,435.20/30,960.42 = 13,009.20/x
3. Step 3: Cross multiply
   22,435.20x = 30,960.42 × 13,009.20
4. Step 4: Simplify right side
   22,435.20x = 402,770,295.86
5. Step 5: Solve for x
   x = 402,770,295.86/22,435.20
6. Step 6: Final answer
   x = 17,952.61