Finding the Fourth Proportional to 9,711.89, 13,453.17 and 9,515.06

Step by Step Solution

1. Step 1: Write the proportion equation
   9,711.89 : 13,453.17 = 9,515.06 : x
2. Step 2: Convert to fraction form
   9,711.89/13,453.17 = 9,515.06/x
3. Step 3: Cross multiply
   9,711.89x = 13,453.17 × 9,515.06
4. Step 4: Simplify right side
   9,711.89x = 128,007,672.16
5. Step 5: Solve for x
   x = 128,007,672.16/9,711.89
6. Step 6: Final answer
   x = 13,180.51