Finding the Fourth Proportional to 9,609.84, 13,259.30 and 5,418.09

Step by Step Solution

1. Step 1: Write the proportion equation
   9,609.84 : 13,259.30 = 5,418.09 : x
2. Step 2: Convert to fraction form
   9,609.84/13,259.30 = 5,418.09/x
3. Step 3: Cross multiply
   9,609.84x = 13,259.30 × 5,418.09
4. Step 4: Simplify right side
   9,609.84x = 71,840,053.65
5. Step 5: Solve for x
   x = 71,840,053.65/9,609.84
6. Step 6: Final answer
   x = 7,475.68