Finding the Fourth Proportional to 10,788.96, 16,161.89 and 8,571.54

Step by Step Solution

1. Step 1: Write the proportion equation
   10,788.96 : 16,161.89 = 8,571.54 : x
2. Step 2: Convert to fraction form
   10,788.96/16,161.89 = 8,571.54/x
3. Step 3: Cross multiply
   10,788.96x = 16,161.89 × 8,571.54
4. Step 4: Simplify right side
   10,788.96x = 138,532,286.61
5. Step 5: Solve for x
   x = 138,532,286.61/10,788.96
6. Step 6: Final answer
   x = 12,840.19