Finding the Fourth Proportional to 3,978.37, 5,967.89 and 1,056.64

Step by Step Solution

1. Step 1: Write the proportion equation
   3,978.37 : 5,967.89 = 1,056.64 : x
2. Step 2: Convert to fraction form
   3,978.37/5,967.89 = 1,056.64/x
3. Step 3: Cross multiply
   3,978.37x = 5,967.89 × 1,056.64
4. Step 4: Simplify right side
   3,978.37x = 6,305,911.29
5. Step 5: Solve for x
   x = 6,305,911.29/3,978.37
6. Step 6: Final answer
   x = 1,585.05