Finding the Fourth Proportional to 11,128.37, 16,687.17 and 4,111.68

Step by Step Solution

1. Step 1: Write the proportion equation
   11,128.37 : 16,687.17 = 4,111.68 : x
2. Step 2: Convert to fraction form
   11,128.37/16,687.17 = 4,111.68/x
3. Step 3: Cross multiply
   11,128.37x = 16,687.17 × 4,111.68
4. Step 4: Simplify right side
   11,128.37x = 68,612,365.72
5. Step 5: Solve for x
   x = 68,612,365.72/11,128.37
6. Step 6: Final answer
   x = 6,165.54