Finding the Fourth Proportional to 12,781.72, 17,642.37 and 8,538.94

Step by Step Solution

1. Step 1: Write the proportion equation
   12,781.72 : 17,642.37 = 8,538.94 : x
2. Step 2: Convert to fraction form
   12,781.72/17,642.37 = 8,538.94/x
3. Step 3: Cross multiply
   12,781.72x = 17,642.37 × 8,538.94
4. Step 4: Simplify right side
   12,781.72x = 150,647,138.89
5. Step 5: Solve for x
   x = 150,647,138.89/12,781.72
6. Step 6: Final answer
   x = 11,786.14