Finding the Fourth Proportional to 8,721.41, 13,079.80 and 3,789.89

Step by Step Solution

1. Step 1: Write the proportion equation
   8,721.41 : 13,079.80 = 3,789.89 : x
2. Step 2: Convert to fraction form
   8,721.41/13,079.80 = 3,789.89/x
3. Step 3: Cross multiply
   8,721.41x = 13,079.80 × 3,789.89
4. Step 4: Simplify right side
   8,721.41x = 49,571,003.22
5. Step 5: Solve for x
   x = 49,571,003.22/8,721.41
6. Step 6: Final answer
   x = 5,683.83