Finding the Fourth Proportional to 3,978.69, 5,967.58 and 1,057.23

Step by Step Solution

1. Step 1: Write the proportion equation
   3,978.69 : 5,967.58 = 1,057.23 : x
2. Step 2: Convert to fraction form
   3,978.69/5,967.58 = 1,057.23/x
3. Step 3: Cross multiply
   3,978.69x = 5,967.58 × 1,057.23
4. Step 4: Simplify right side
   3,978.69x = 6,309,104.60
5. Step 5: Solve for x
   x = 6,309,104.60/3,978.69
6. Step 6: Final answer
   x = 1,585.72