Finding the Fourth Proportional to 21,004.34, 28,983.25 and 13,451.37

Step by Step Solution

1. Step 1: Write the proportion equation
   21,004.34 : 28,983.25 = 13,451.37 : x
2. Step 2: Convert to fraction form
   21,004.34/28,983.25 = 13,451.37/x
3. Step 3: Cross multiply
   21,004.34x = 28,983.25 × 13,451.37
4. Step 4: Simplify right side
   21,004.34x = 389,864,419.55
5. Step 5: Solve for x
   x = 389,864,419.55/21,004.34
6. Step 6: Final answer
   x = 18,561.14