Finding the Fourth Proportional to 8,707.69, 12,020.28 and 5,878.89

Step by Step Solution

1. Step 1: Write the proportion equation
   8,707.69 : 12,020.28 = 5,878.89 : x
2. Step 2: Convert to fraction form
   8,707.69/12,020.28 = 5,878.89/x
3. Step 3: Cross multiply
   8,707.69x = 12,020.28 × 5,878.89
4. Step 4: Simplify right side
   8,707.69x = 70,665,940.96
5. Step 5: Solve for x
   x = 70,665,940.96/8,707.69
6. Step 6: Final answer
   x = 8,115.35