Finding the Fourth Proportional to 9,665.40, 13,339.52 and 5,418.08

Step by Step Solution

1. Step 1: Write the proportion equation
   9,665.40 : 13,339.52 = 5,418.08 : x
2. Step 2: Convert to fraction form
   9,665.40/13,339.52 = 5,418.08/x
3. Step 3: Cross multiply
   9,665.40x = 13,339.52 × 5,418.08
4. Step 4: Simplify right side
   9,665.40x = 72,274,586.52
5. Step 5: Solve for x
   x = 72,274,586.52/9,665.40
6. Step 6: Final answer
   x = 7,477.66