Finding the Fourth Proportional to 12,897.07, 17,790.39 and 8,109.42

Step by Step Solution

1. Step 1: Write the proportion equation
   12,897.07 : 17,790.39 = 8,109.42 : x
2. Step 2: Convert to fraction form
   12,897.07/17,790.39 = 8,109.42/x
3. Step 3: Cross multiply
   12,897.07x = 17,790.39 × 8,109.42
4. Step 4: Simplify right side
   12,897.07x = 144,269,744.47
5. Step 5: Solve for x
   x = 144,269,744.47/12,897.07
6. Step 6: Final answer
   x = 11,186.25