Finding the Fourth Proportional to 12,861.75, 17,751.49 and 7,556.57

Step by Step Solution

1. Step 1: Write the proportion equation
   12,861.75 : 17,751.49 = 7,556.57 : x
2. Step 2: Convert to fraction form
   12,861.75/17,751.49 = 7,556.57/x
3. Step 3: Cross multiply
   12,861.75x = 17,751.49 × 7,556.57
4. Step 4: Simplify right side
   12,861.75x = 134,140,288.03
5. Step 5: Solve for x
   x = 134,140,288.03/12,861.75
6. Step 6: Final answer
   x = 10,429.40