Finding the Fourth Proportional to 11,403.57, 17,111.27 and 8,629.41

Step by Step Solution

1. Step 1: Write the proportion equation
   11,403.57 : 17,111.27 = 8,629.41 : x
2. Step 2: Convert to fraction form
   11,403.57/17,111.27 = 8,629.41/x
3. Step 3: Cross multiply
   11,403.57x = 17,111.27 × 8,629.41
4. Step 4: Simplify right side
   11,403.57x = 147,660,164.45
5. Step 5: Solve for x
   x = 147,660,164.45/11,403.57
6. Step 6: Final answer
   x = 12,948.59