Finding the Fourth Proportional to 21,039.68, 29,037.33 and 12,087.16

Step by Step Solution

1. Step 1: Write the proportion equation
   21,039.68 : 29,037.33 = 12,087.16 : x
2. Step 2: Convert to fraction form
   21,039.68/29,037.33 = 12,087.16/x
3. Step 3: Cross multiply
   21,039.68x = 29,037.33 × 12,087.16
4. Step 4: Simplify right side
   21,039.68x = 350,978,781.09
5. Step 5: Solve for x
   x = 350,978,781.09/21,039.68
6. Step 6: Final answer
   x = 16,681.75