Finding the Fourth Proportional to 12,860.55, 17,747.69 and 7,555.59

Step by Step Solution

1. Step 1: Write the proportion equation
   12,860.55 : 17,747.69 = 7,555.59 : x
2. Step 2: Convert to fraction form
   12,860.55/17,747.69 = 7,555.59/x
3. Step 3: Cross multiply
   12,860.55x = 17,747.69 × 7,555.59
4. Step 4: Simplify right side
   12,860.55x = 134,094,269.09
5. Step 5: Solve for x
   x = 134,094,269.09/12,860.55
6. Step 6: Final answer
   x = 10,426.79