Finding the Fourth Proportional to 16,749.39, 25,128.72 and 13,621.67

Step by Step Solution

1. Step 1: Write the proportion equation
   16,749.39 : 25,128.72 = 13,621.67 : x
2. Step 2: Convert to fraction form
   16,749.39/25,128.72 = 13,621.67/x
3. Step 3: Cross multiply
   16,749.39x = 25,128.72 × 13,621.67
4. Step 4: Simplify right side
   16,749.39x = 342,295,005.72
5. Step 5: Solve for x
   x = 342,295,005.72/16,749.39
6. Step 6: Final answer
   x = 20,436.27