Finding the Fourth Proportional to 10,789.13, 16,108.01 and 9,128.82

Step by Step Solution

1. Step 1: Write the proportion equation
   10,789.13 : 16,108.01 = 9,128.82 : x
2. Step 2: Convert to fraction form
   10,789.13/16,108.01 = 9,128.82/x
3. Step 3: Cross multiply
   10,789.13x = 16,108.01 × 9,128.82
4. Step 4: Simplify right side
   10,789.13x = 147,047,078.20
5. Step 5: Solve for x
   x = 147,047,078.20/10,789.13
6. Step 6: Final answer
   x = 13,629.19