Finding the Fourth Proportional to 12,865.98, 17,757.82 and 7,831.83

Step by Step Solution

1. Step 1: Write the proportion equation
   12,865.98 : 17,757.82 = 7,831.83 : x
2. Step 2: Convert to fraction form
   12,865.98/17,757.82 = 7,831.83/x
3. Step 3: Cross multiply
   12,865.98x = 17,757.82 × 7,831.83
4. Step 4: Simplify right side
   12,865.98x = 139,076,159.85
5. Step 5: Solve for x
   x = 139,076,159.85/12,865.98
6. Step 6: Final answer
   x = 10,809.61