Finding the Fourth Proportional to 21,519, 29,696.49 and 13,021.29

Step by Step Solution

1. Step 1: Write the proportion equation
   21,519 : 29,696.49 = 13,021.29 : x
2. Step 2: Convert to fraction form
   21,519/29,696.49 = 13,021.29/x
3. Step 3: Cross multiply
   21,519x = 29,696.49 × 13,021.29
4. Step 4: Simplify right side
   21,519x = 386,686,608.27
5. Step 5: Solve for x
   x = 386,686,608.27/21,519
6. Step 6: Final answer
   x = 17,969.54