Finding the Fourth Proportional to 3,986.88, 5,979.86 and 1,065.41

Step by Step Solution

1. Step 1: Write the proportion equation
   3,986.88 : 5,979.86 = 1,065.41 : x
2. Step 2: Convert to fraction form
   3,986.88/5,979.86 = 1,065.41/x
3. Step 3: Cross multiply
   3,986.88x = 5,979.86 × 1,065.41
4. Step 4: Simplify right side
   3,986.88x = 6,371,012.27
5. Step 5: Solve for x
   x = 6,371,012.27/3,986.88
6. Step 6: Final answer
   x = 1,597.99