Finding the Fourth Proportional to 3,978.12, 5,967.34 and 1,056.45

Step by Step Solution

1. Step 1: Write the proportion equation
   3,978.12 : 5,967.34 = 1,056.45 : x
2. Step 2: Convert to fraction form
   3,978.12/5,967.34 = 1,056.45/x
3. Step 3: Cross multiply
   3,978.12x = 5,967.34 × 1,056.45
4. Step 4: Simplify right side
   3,978.12x = 6,304,196.34
5. Step 5: Solve for x
   x = 6,304,196.34/3,978.12
6. Step 6: Final answer
   x = 1,584.72