Finding the Fourth Proportional to 3,988.69, 5,986.49 and 3,979.46

Step by Step Solution

1. Step 1: Write the proportion equation
   3,988.69 : 5,986.49 = 3,979.46 : x
2. Step 2: Convert to fraction form
   3,988.69/5,986.49 = 3,979.46/x
3. Step 3: Cross multiply
   3,988.69x = 5,986.49 × 3,979.46
4. Step 4: Simplify right side
   3,988.69x = 23,823,014.95
5. Step 5: Solve for x
   x = 23,823,014.95/3,988.69
6. Step 6: Final answer
   x = 5,972.64