Finding the Fourth Proportional to 12,009.69, 17,990.37 and 5,987.61

Step by Step Solution

1. Step 1: Write the proportion equation
   12,009.69 : 17,990.37 = 5,987.61 : x
2. Step 2: Convert to fraction form
   12,009.69/17,990.37 = 5,987.61/x
3. Step 3: Cross multiply
   12,009.69x = 17,990.37 × 5,987.61
4. Step 4: Simplify right side
   12,009.69x = 107,719,319.32
5. Step 5: Solve for x
   x = 107,719,319.32/12,009.69
6. Step 6: Final answer
   x = 8,969.37