Finding the Fourth Proportional to 3,951.99, 5,915.12 and 2,911.58

Step by Step Solution

1. Step 1: Write the proportion equation
   3,951.99 : 5,915.12 = 2,911.58 : x
2. Step 2: Convert to fraction form
   3,951.99/5,915.12 = 2,911.58/x
3. Step 3: Cross multiply
   3,951.99x = 5,915.12 × 2,911.58
4. Step 4: Simplify right side
   3,951.99x = 17,222,300.96
5. Step 5: Solve for x
   x = 17,222,300.96/3,951.99
6. Step 6: Final answer
   x = 4,357.88