Finding the Fourth Proportional to 11,147.69, 16,721.89 and 4,129.47

Step by Step Solution

1. Step 1: Write the proportion equation
   11,147.69 : 16,721.89 = 4,129.47 : x
2. Step 2: Convert to fraction form
   11,147.69/16,721.89 = 4,129.47/x
3. Step 3: Cross multiply
   11,147.69x = 16,721.89 × 4,129.47
4. Step 4: Simplify right side
   11,147.69x = 69,052,543.10
5. Step 5: Solve for x
   x = 69,052,543.10/11,147.69
6. Step 6: Final answer
   x = 6,194.34