Finding the Fourth Proportional to 10,912.06, 16,367.97 and 3,986.50

Step by Step Solution

1. Step 1: Write the proportion equation
   10,912.06 : 16,367.97 = 3,986.50 : x
2. Step 2: Convert to fraction form
   10,912.06/16,367.97 = 3,986.50/x
3. Step 3: Cross multiply
   10,912.06x = 16,367.97 × 3,986.50
4. Step 4: Simplify right side
   10,912.06x = 65,250,912.41
5. Step 5: Solve for x
   x = 65,250,912.41/10,912.06
6. Step 6: Final answer
   x = 5,979.71