Finding the Fourth Proportional to 9,256.68, 12,780.18 and 8,260.25

Step by Step Solution

1. Step 1: Write the proportion equation
   9,256.68 : 12,780.18 = 8,260.25 : x
2. Step 2: Convert to fraction form
   9,256.68/12,780.18 = 8,260.25/x
3. Step 3: Cross multiply
   9,256.68x = 12,780.18 × 8,260.25
4. Step 4: Simplify right side
   9,256.68x = 105,567,417.94
5. Step 5: Solve for x
   x = 105,567,417.94/9,256.68
6. Step 6: Final answer
   x = 11,404.46