Finding the Fourth Proportional to 12,636.28, 17,434.56 and 8,160.22

Step by Step Solution

1. Step 1: Write the proportion equation
   12,636.28 : 17,434.56 = 8,160.22 : x
2. Step 2: Convert to fraction form
   12,636.28/17,434.56 = 8,160.22/x
3. Step 3: Cross multiply
   12,636.28x = 17,434.56 × 8,160.22
4. Step 4: Simplify right side
   12,636.28x = 142,269,832.22
5. Step 5: Solve for x
   x = 142,269,832.22/12,636.28
6. Step 6: Final answer
   x = 11,258.84