Finding the Fourth Proportional to 11,218.72, 16,819.98 and 3,423.28

Step by Step Solution

1. Step 1: Write the proportion equation
   11,218.72 : 16,819.98 = 3,423.28 : x
2. Step 2: Convert to fraction form
   11,218.72/16,819.98 = 3,423.28/x
3. Step 3: Cross multiply
   11,218.72x = 16,819.98 × 3,423.28
4. Step 4: Simplify right side
   11,218.72x = 57,579,501.13
5. Step 5: Solve for x
   x = 57,579,501.13/11,218.72
6. Step 6: Final answer
   x = 5,132.45