Finding the Fourth Proportional to 12,918.03, 17,819.35 and 8,136.10

Step by Step Solution

1. Step 1: Write the proportion equation
   12,918.03 : 17,819.35 = 8,136.10 : x
2. Step 2: Convert to fraction form
   12,918.03/17,819.35 = 8,136.10/x
3. Step 3: Cross multiply
   12,918.03x = 17,819.35 × 8,136.10
4. Step 4: Simplify right side
   12,918.03x = 144,980,013.54
5. Step 5: Solve for x
   x = 144,980,013.54/12,918.03
6. Step 6: Final answer
   x = 11,223.07