Finding the Fourth Proportional to 11,328.93, 17,087.73 and 9,959.31

Step by Step Solution

1. Step 1: Write the proportion equation
   11,328.93 : 17,087.73 = 9,959.31 : x
2. Step 2: Convert to fraction form
   11,328.93/17,087.73 = 9,959.31/x
3. Step 3: Cross multiply
   11,328.93x = 17,087.73 × 9,959.31
4. Step 4: Simplify right side
   11,328.93x = 170,182,000.27
5. Step 5: Solve for x
   x = 170,182,000.27/11,328.93
6. Step 6: Final answer
   x = 15,021.90