Finding the Fourth Proportional to 11,424.76, 17,128.86 and 7,717.72

Step by Step Solution

1. Step 1: Write the proportion equation
   11,424.76 : 17,128.86 = 7,717.72 : x
2. Step 2: Convert to fraction form
   11,424.76/17,128.86 = 7,717.72/x
3. Step 3: Cross multiply
   11,424.76x = 17,128.86 × 7,717.72
4. Step 4: Simplify right side
   11,424.76x = 132,195,745.40
5. Step 5: Solve for x
   x = 132,195,745.40/11,424.76
6. Step 6: Final answer
   x = 11,570.99