Finding the Fourth Proportional to 13,647.15, 18,831.73 and 7,678.69

Step by Step Solution

1. Step 1: Write the proportion equation
   13,647.15 : 18,831.73 = 7,678.69 : x
2. Step 2: Convert to fraction form
   13,647.15/18,831.73 = 7,678.69/x
3. Step 3: Cross multiply
   13,647.15x = 18,831.73 × 7,678.69
4. Step 4: Simplify right side
   13,647.15x = 144,603,016.83
5. Step 5: Solve for x
   x = 144,603,016.83/13,647.15
6. Step 6: Final answer
   x = 10,595.84