Finding the Fourth Proportional to 11,789.37, 17,680.31 and 3,890.42

Step by Step Solution

1. Step 1: Write the proportion equation
   11,789.37 : 17,680.31 = 3,890.42 : x
2. Step 2: Convert to fraction form
   11,789.37/17,680.31 = 3,890.42/x
3. Step 3: Cross multiply
   11,789.37x = 17,680.31 × 3,890.42
4. Step 4: Simplify right side
   11,789.37x = 68,783,797.37
5. Step 5: Solve for x
   x = 68,783,797.37/11,789.37
6. Step 6: Final answer
   x = 5,834.39