Finding the Fourth Proportional to 3,944.69, 5,915.75 and 1,311.49

Step by Step Solution

1. Step 1: Write the proportion equation
   3,944.69 : 5,915.75 = 1,311.49 : x
2. Step 2: Convert to fraction form
   3,944.69/5,915.75 = 1,311.49/x
3. Step 3: Cross multiply
   3,944.69x = 5,915.75 × 1,311.49
4. Step 4: Simplify right side
   3,944.69x = 7,758,421.91
5. Step 5: Solve for x
   x = 7,758,421.91/3,944.69
6. Step 6: Final answer
   x = 1,966.80