Finding the Fourth Proportional to 10,864.89, 16,269.75 and 9,105.28

Step by Step Solution

1. Step 1: Write the proportion equation
   10,864.89 : 16,269.75 = 9,105.28 : x
2. Step 2: Convert to fraction form
   10,864.89/16,269.75 = 9,105.28/x
3. Step 3: Cross multiply
   10,864.89x = 16,269.75 × 9,105.28
4. Step 4: Simplify right side
   10,864.89x = 148,140,588.61
5. Step 5: Solve for x
   x = 148,140,588.61/10,864.89
6. Step 6: Final answer
   x = 13,634.80