Finding the Fourth Proportional to 9,665.39, 13,339.38 and 5,890.79

Step by Step Solution

1. Step 1: Write the proportion equation
   9,665.39 : 13,339.38 = 5,890.79 : x
2. Step 2: Convert to fraction form
   9,665.39/13,339.38 = 5,890.79/x
3. Step 3: Cross multiply
   9,665.39x = 13,339.38 × 5,890.79
4. Step 4: Simplify right side
   9,665.39x = 78,579,541.75
5. Step 5: Solve for x
   x = 78,579,541.75/9,665.39
6. Step 6: Final answer
   x = 8,129.99