Finding the Fourth Proportional to 3,978.18, 5,966.78 and 1,056.69

Step by Step Solution

1. Step 1: Write the proportion equation
   3,978.18 : 5,966.78 = 1,056.69 : x
2. Step 2: Convert to fraction form
   3,978.18/5,966.78 = 1,056.69/x
3. Step 3: Cross multiply
   3,978.18x = 5,966.78 × 1,056.69
4. Step 4: Simplify right side
   3,978.18x = 6,305,031.47
5. Step 5: Solve for x
   x = 6,305,031.47/3,978.18
6. Step 6: Final answer
   x = 1,584.90