Finding the Fourth Proportional to 16,178.72, 22,321.28 and 13,189.40

Step by Step Solution

1. Step 1: Write the proportion equation
   16,178.72 : 22,321.28 = 13,189.40 : x
2. Step 2: Convert to fraction form
   16,178.72/22,321.28 = 13,189.40/x
3. Step 3: Cross multiply
   16,178.72x = 22,321.28 × 13,189.40
4. Step 4: Simplify right side
   16,178.72x = 294,404,290.43
5. Step 5: Solve for x
   x = 294,404,290.43/16,178.72
6. Step 6: Final answer
   x = 18,197.01