Finding the Fourth Proportional to 13,610.89, 18,769.21 and 12,817.18

Step by Step Solution

1. Step 1: Write the proportion equation
   13,610.89 : 18,769.21 = 12,817.18 : x
2. Step 2: Convert to fraction form
   13,610.89/18,769.21 = 12,817.18/x
3. Step 3: Cross multiply
   13,610.89x = 18,769.21 × 12,817.18
4. Step 4: Simplify right side
   13,610.89x = 240,568,185.10
5. Step 5: Solve for x
   x = 240,568,185.10/13,610.89
6. Step 6: Final answer
   x = 17,674.69