Finding the Fourth Proportional to 8,443.15, 11,644.89 and 7,877.25

Step by Step Solution

1. Step 1: Write the proportion equation
   8,443.15 : 11,644.89 = 7,877.25 : x
2. Step 2: Convert to fraction form
   8,443.15/11,644.89 = 7,877.25/x
3. Step 3: Cross multiply
   8,443.15x = 11,644.89 × 7,877.25
4. Step 4: Simplify right side
   8,443.15x = 91,729,709.75
5. Step 5: Solve for x
   x = 91,729,709.75/8,443.15
6. Step 6: Final answer
   x = 10,864.39