Finding the Fourth Proportional to 12,555.21, 17,328.56 and 8,306.49

Step by Step Solution

1. Step 1: Write the proportion equation
   12,555.21 : 17,328.56 = 8,306.49 : x
2. Step 2: Convert to fraction form
   12,555.21/17,328.56 = 8,306.49/x
3. Step 3: Cross multiply
   12,555.21x = 17,328.56 × 8,306.49
4. Step 4: Simplify right side
   12,555.21x = 143,939,510.35
5. Step 5: Solve for x
   x = 143,939,510.35/12,555.21
6. Step 6: Final answer
   x = 11,464.52