Finding the Fourth Proportional to 3,978.21, 5,967.38 and 1,381.23

Step by Step Solution

1. Step 1: Write the proportion equation
   3,978.21 : 5,967.38 = 1,381.23 : x
2. Step 2: Convert to fraction form
   3,978.21/5,967.38 = 1,381.23/x
3. Step 3: Cross multiply
   3,978.21x = 5,967.38 × 1,381.23
4. Step 4: Simplify right side
   3,978.21x = 8,242,317.37
5. Step 5: Solve for x
   x = 8,242,317.37/3,978.21
6. Step 6: Final answer
   x = 2,071.87