Finding the Fourth Proportional to 11,559.15, 15,951.78 and 7,020.54

Step by Step Solution

1. Step 1: Write the proportion equation
   11,559.15 : 15,951.78 = 7,020.54 : x
2. Step 2: Convert to fraction form
   11,559.15/15,951.78 = 7,020.54/x
3. Step 3: Cross multiply
   11,559.15x = 15,951.78 × 7,020.54
4. Step 4: Simplify right side
   11,559.15x = 111,990,109.56
5. Step 5: Solve for x
   x = 111,990,109.56/11,559.15
6. Step 6: Final answer
   x = 9,688.44