Finding the Fourth Proportional to 3,978.24, 5,969.46 and 2,891.60

Step by Step Solution

1. Step 1: Write the proportion equation
   3,978.24 : 5,969.46 = 2,891.60 : x
2. Step 2: Convert to fraction form
   3,978.24/5,969.46 = 2,891.60/x
3. Step 3: Cross multiply
   3,978.24x = 5,969.46 × 2,891.60
4. Step 4: Simplify right side
   3,978.24x = 17,261,290.54
5. Step 5: Solve for x
   x = 17,261,290.54/3,978.24
6. Step 6: Final answer
   x = 4,338.93