Finding the Fourth Proportional to 21,003.68, 28,997.52 and 13,936.16

Step by Step Solution

1. Step 1: Write the proportion equation
   21,003.68 : 28,997.52 = 13,936.16 : x
2. Step 2: Convert to fraction form
   21,003.68/28,997.52 = 13,936.16/x
3. Step 3: Cross multiply
   21,003.68x = 28,997.52 × 13,936.16
4. Step 4: Simplify right side
   21,003.68x = 404,114,078.32
5. Step 5: Solve for x
   x = 404,114,078.32/21,003.68
6. Step 6: Final answer
   x = 19,240.16