Finding the Fourth Proportional to 3,978.56, 5,967.39 and 1,057.10

Step by Step Solution

1. Step 1: Write the proportion equation
   3,978.56 : 5,967.39 = 1,057.10 : x
2. Step 2: Convert to fraction form
   3,978.56/5,967.39 = 1,057.10/x
3. Step 3: Cross multiply
   3,978.56x = 5,967.39 × 1,057.10
4. Step 4: Simplify right side
   3,978.56x = 6,308,127.97
5. Step 5: Solve for x
   x = 6,308,127.97/3,978.56
6. Step 6: Final answer
   x = 1,585.53