Finding the Fourth Proportional to 2,915.20, 4,375.04 and 1,185.28

Step by Step Solution

1. Step 1: Write the proportion equation
   2,915.20 : 4,375.04 = 1,185.28 : x
2. Step 2: Convert to fraction form
   2,915.20/4,375.04 = 1,185.28/x
3. Step 3: Cross multiply
   2,915.20x = 4,375.04 × 1,185.28
4. Step 4: Simplify right side
   2,915.20x = 5,185,647.41
5. Step 5: Solve for x
   x = 5,185,647.41/2,915.20
6. Step 6: Final answer
   x = 1,778.83