Finding the Fourth Proportional to 12,387.59, 17,109.07 and 8,157.56

Step by Step Solution

1. Step 1: Write the proportion equation
   12,387.59 : 17,109.07 = 8,157.56 : x
2. Step 2: Convert to fraction form
   12,387.59/17,109.07 = 8,157.56/x
3. Step 3: Cross multiply
   12,387.59x = 17,109.07 × 8,157.56
4. Step 4: Simplify right side
   12,387.59x = 139,568,265.07
5. Step 5: Solve for x
   x = 139,568,265.07/12,387.59
6. Step 6: Final answer
   x = 11,266.78