Finding the Fourth Proportional to 3,978.09, 5,967.13 and 1,381.05

Step by Step Solution

1. Step 1: Write the proportion equation
   3,978.09 : 5,967.13 = 1,381.05 : x
2. Step 2: Convert to fraction form
   3,978.09/5,967.13 = 1,381.05/x
3. Step 3: Cross multiply
   3,978.09x = 5,967.13 × 1,381.05
4. Step 4: Simplify right side
   3,978.09x = 8,240,904.89
5. Step 5: Solve for x
   x = 8,240,904.89/3,978.09
6. Step 6: Final answer
   x = 2,071.57