Finding the Fourth Proportional to 12,859.37, 17,740.86 and 8,076.50

Step by Step Solution

1. Step 1: Write the proportion equation
   12,859.37 : 17,740.86 = 8,076.50 : x
2. Step 2: Convert to fraction form
   12,859.37/17,740.86 = 8,076.50/x
3. Step 3: Cross multiply
   12,859.37x = 17,740.86 × 8,076.50
4. Step 4: Simplify right side
   12,859.37x = 143,284,055.79
5. Step 5: Solve for x
   x = 143,284,055.79/12,859.37
6. Step 6: Final answer
   x = 11,142.39