Finding the Fourth Proportional to 9,578.78, 13,218.47 and 5,545.05

Step by Step Solution

1. Step 1: Write the proportion equation
   9,578.78 : 13,218.47 = 5,545.05 : x
2. Step 2: Convert to fraction form
   9,578.78/13,218.47 = 5,545.05/x
3. Step 3: Cross multiply
   9,578.78x = 13,218.47 × 5,545.05
4. Step 4: Simplify right side
   9,578.78x = 73,297,077.07
5. Step 5: Solve for x
   x = 73,297,077.07/9,578.78
6. Step 6: Final answer
   x = 7,652.03