Finding the Fourth Proportional to 11,128.88, 16,690.71 and 3,229.31

Step by Step Solution

1. Step 1: Write the proportion equation
   11,128.88 : 16,690.71 = 3,229.31 : x
2. Step 2: Convert to fraction form
   11,128.88/16,690.71 = 3,229.31/x
3. Step 3: Cross multiply
   11,128.88x = 16,690.71 × 3,229.31
4. Step 4: Simplify right side
   11,128.88x = 53,899,476.71
5. Step 5: Solve for x
   x = 53,899,476.71/11,128.88
6. Step 6: Final answer
   x = 4,843.21