Finding the Fourth Proportional to 9,128.71, 13,627.03 and 8,021.54

Step by Step Solution

1. Step 1: Write the proportion equation
   9,128.71 : 13,627.03 = 8,021.54 : x
2. Step 2: Convert to fraction form
   9,128.71/13,627.03 = 8,021.54/x
3. Step 3: Cross multiply
   9,128.71x = 13,627.03 × 8,021.54
4. Step 4: Simplify right side
   9,128.71x = 109,309,766.23
5. Step 5: Solve for x
   x = 109,309,766.23/9,128.71
6. Step 6: Final answer
   x = 11,974.28