Finding the Fourth Proportional to 12,806.10, 19,196.10 and 8,636.22

Step by Step Solution

1. Step 1: Write the proportion equation
   12,806.10 : 19,196.10 = 8,636.22 : x
2. Step 2: Convert to fraction form
   12,806.10/19,196.10 = 8,636.22/x
3. Step 3: Cross multiply
   12,806.10x = 19,196.10 × 8,636.22
4. Step 4: Simplify right side
   12,806.10x = 165,781,742.74
5. Step 5: Solve for x
   x = 165,781,742.74/12,806.10
6. Step 6: Final answer
   x = 12,945.53