Finding the Fourth Proportional to 21,440.50, 29,587.89 and 12,009.04

Step by Step Solution

1. Step 1: Write the proportion equation
   21,440.50 : 29,587.89 = 12,009.04 : x
2. Step 2: Convert to fraction form
   21,440.50/29,587.89 = 12,009.04/x
3. Step 3: Cross multiply
   21,440.50x = 29,587.89 × 12,009.04
4. Step 4: Simplify right side
   21,440.50x = 355,322,154.53
5. Step 5: Solve for x
   x = 355,322,154.53/21,440.50
6. Step 6: Final answer
   x = 16,572.48