Finding the Fourth Proportional to 12,009.50, 17,990.13 and 5,987.45

Step by Step Solution

1. Step 1: Write the proportion equation
   12,009.50 : 17,990.13 = 5,987.45 : x
2. Step 2: Convert to fraction form
   12,009.50/17,990.13 = 5,987.45/x
3. Step 3: Cross multiply
   12,009.50x = 17,990.13 × 5,987.45
4. Step 4: Simplify right side
   12,009.50x = 107,715,003.87
5. Step 5: Solve for x
   x = 107,715,003.87/12,009.50
6. Step 6: Final answer
   x = 8,969.15