Finding the Fourth Proportional to 11,909.90, 17,867.42 and 3,589.28

Step by Step Solution

1. Step 1: Write the proportion equation
   11,909.90 : 17,867.42 = 3,589.28 : x
2. Step 2: Convert to fraction form
   11,909.90/17,867.42 = 3,589.28/x
3. Step 3: Cross multiply
   11,909.90x = 17,867.42 × 3,589.28
4. Step 4: Simplify right side
   11,909.90x = 64,131,065.97
5. Step 5: Solve for x
   x = 64,131,065.97/11,909.90
6. Step 6: Final answer
   x = 5,384.69