Finding the Fourth Proportional to 3,978.21, 5,970.57 and 1,671.33

Step by Step Solution

1. Step 1: Write the proportion equation
   3,978.21 : 5,970.57 = 1,671.33 : x
2. Step 2: Convert to fraction form
   3,978.21/5,970.57 = 1,671.33/x
3. Step 3: Cross multiply
   3,978.21x = 5,970.57 × 1,671.33
4. Step 4: Simplify right side
   3,978.21x = 9,978,792.76
5. Step 5: Solve for x
   x = 9,978,792.76/3,978.21
6. Step 6: Final answer
   x = 2,508.36