Finding the Fourth Proportional to 20,741, 28,622.58 and 13,289.48

Step by Step Solution

1. Step 1: Write the proportion equation
   20,741 : 28,622.58 = 13,289.48 : x
2. Step 2: Convert to fraction form
   20,741/28,622.58 = 13,289.48/x
3. Step 3: Cross multiply
   20,741x = 28,622.58 × 13,289.48
4. Step 4: Simplify right side
   20,741x = 380,379,204.46
5. Step 5: Solve for x
   x = 380,379,204.46/20,741
6. Step 6: Final answer
   x = 18,339.48