Finding the Fourth Proportional to 9,791.72, 13,522.66 and 8,386.28

Step by Step Solution

1. Step 1: Write the proportion equation
   9,791.72 : 13,522.66 = 8,386.28 : x
2. Step 2: Convert to fraction form
   9,791.72/13,522.66 = 8,386.28/x
3. Step 3: Cross multiply
   9,791.72x = 13,522.66 × 8,386.28
4. Step 4: Simplify right side
   9,791.72x = 113,404,813.10
5. Step 5: Solve for x
   x = 113,404,813.10/9,791.72
6. Step 6: Final answer
   x = 11,581.71