Finding the Fourth Proportional to 9,362.78, 12,920.53 and 5,383.91

Step by Step Solution

1. Step 1: Write the proportion equation
   9,362.78 : 12,920.53 = 5,383.91 : x
2. Step 2: Convert to fraction form
   9,362.78/12,920.53 = 5,383.91/x
3. Step 3: Cross multiply
   9,362.78x = 12,920.53 × 5,383.91
4. Step 4: Simplify right side
   9,362.78x = 69,562,879.15
5. Step 5: Solve for x
   x = 69,562,879.15/9,362.78
6. Step 6: Final answer
   x = 7,429.72