Finding the Fourth Proportional to 12,768.62, 17,615.67 and 9,419.50

Step by Step Solution

1. Step 1: Write the proportion equation
   12,768.62 : 17,615.67 = 9,419.50 : x
2. Step 2: Convert to fraction form
   12,768.62/17,615.67 = 9,419.50/x
3. Step 3: Cross multiply
   12,768.62x = 17,615.67 × 9,419.50
4. Step 4: Simplify right side
   12,768.62x = 165,930,803.57
5. Step 5: Solve for x
   x = 165,930,803.57/12,768.62
6. Step 6: Final answer
   x = 12,995.20