Finding the Fourth Proportional to 12,942.30, 17,866.39 and 9,756.89

Step by Step Solution

1. Step 1: Write the proportion equation
   12,942.30 : 17,866.39 = 9,756.89 : x
2. Step 2: Convert to fraction form
   12,942.30/17,866.39 = 9,756.89/x
3. Step 3: Cross multiply
   12,942.30x = 17,866.39 × 9,756.89
4. Step 4: Simplify right side
   12,942.30x = 174,320,373.50
5. Step 5: Solve for x
   x = 174,320,373.50/12,942.30
6. Step 6: Final answer
   x = 13,469.04