Finding the Fourth Proportional to 21,020.82, 29,003.61 and 12,517.49

Step by Step Solution

1. Step 1: Write the proportion equation
   21,020.82 : 29,003.61 = 12,517.49 : x
2. Step 2: Convert to fraction form
   21,020.82/29,003.61 = 12,517.49/x
3. Step 3: Cross multiply
   21,020.82x = 29,003.61 × 12,517.49
4. Step 4: Simplify right side
   21,020.82x = 363,052,253.12
5. Step 5: Solve for x
   x = 363,052,253.12/21,020.82
6. Step 6: Final answer
   x = 17,271.08