Finding the Fourth Proportional to 12,636.82, 17,429.41 and 9,278.58

Step by Step Solution

1. Step 1: Write the proportion equation
   12,636.82 : 17,429.41 = 9,278.58 : x
2. Step 2: Convert to fraction form
   12,636.82/17,429.41 = 9,278.58/x
3. Step 3: Cross multiply
   12,636.82x = 17,429.41 × 9,278.58
4. Step 4: Simplify right side
   12,636.82x = 161,720,175.04
5. Step 5: Solve for x
   x = 161,720,175.04/12,636.82
6. Step 6: Final answer
   x = 12,797.54