Finding the Fourth Proportional to 12,255.04, 16,921.61 and 9,857.28

Step by Step Solution

1. Step 1: Write the proportion equation
   12,255.04 : 16,921.61 = 9,857.28 : x
2. Step 2: Convert to fraction form
   12,255.04/16,921.61 = 9,857.28/x
3. Step 3: Cross multiply
   12,255.04x = 16,921.61 × 9,857.28
4. Step 4: Simplify right side
   12,255.04x = 166,801,047.82
5. Step 5: Solve for x
   x = 166,801,047.82/12,255.04
6. Step 6: Final answer
   x = 13,610.81