Finding the Fourth Proportional to 9,578.69, 13,218.47 and 5,386.94

Step by Step Solution

1. Step 1: Write the proportion equation
   9,578.69 : 13,218.47 = 5,386.94 : x
2. Step 2: Convert to fraction form
   9,578.69/13,218.47 = 5,386.94/x
3. Step 3: Cross multiply
   9,578.69x = 13,218.47 × 5,386.94
4. Step 4: Simplify right side
   9,578.69x = 71,207,131.09
5. Step 5: Solve for x
   x = 71,207,131.09/9,578.69
6. Step 6: Final answer
   x = 7,433.91