Finding the Fourth Proportional to 11,729.30, 17,561.55 and 9,137.30

Step by Step Solution

1. Step 1: Write the proportion equation
   11,729.30 : 17,561.55 = 9,137.30 : x
2. Step 2: Convert to fraction form
   11,729.30/17,561.55 = 9,137.30/x
3. Step 3: Cross multiply
   11,729.30x = 17,561.55 × 9,137.30
4. Step 4: Simplify right side
   11,729.30x = 160,465,150.82
5. Step 5: Solve for x
   x = 160,465,150.82/11,729.30
6. Step 6: Final answer
   x = 13,680.71