Finding the Fourth Proportional to 13,986.78, 20,967.86 and 9,057.83

Step by Step Solution

1. Step 1: Write the proportion equation
   13,986.78 : 20,967.86 = 9,057.83 : x
2. Step 2: Convert to fraction form
   13,986.78/20,967.86 = 9,057.83/x
3. Step 3: Cross multiply
   13,986.78x = 20,967.86 × 9,057.83
4. Step 4: Simplify right side
   13,986.78x = 189,923,229.15
5. Step 5: Solve for x
   x = 189,923,229.15/13,986.78
6. Step 6: Final answer
   x = 13,578.77