Finding the Fourth Proportional to 8,918.72, 12,314.40 and 8,255.28

Step by Step Solution

1. Step 1: Write the proportion equation
   8,918.72 : 12,314.40 = 8,255.28 : x
2. Step 2: Convert to fraction form
   8,918.72/12,314.40 = 8,255.28/x
3. Step 3: Cross multiply
   8,918.72x = 12,314.40 × 8,255.28
4. Step 4: Simplify right side
   8,918.72x = 101,658,820.03
5. Step 5: Solve for x
   x = 101,658,820.03/8,918.72
6. Step 6: Final answer
   x = 11,398.36