Finding the Fourth Proportional to 3,978.96, 5,971.68 and 2,827.68

Step by Step Solution

1. Step 1: Write the proportion equation
   3,978.96 : 5,971.68 = 2,827.68 : x
2. Step 2: Convert to fraction form
   3,978.96/5,971.68 = 2,827.68/x
3. Step 3: Cross multiply
   3,978.96x = 5,971.68 × 2,827.68
4. Step 4: Simplify right side
   3,978.96x = 16,886,000.10
5. Step 5: Solve for x
   x = 16,886,000.10/3,978.96
6. Step 6: Final answer
   x = 4,243.82