Finding the Fourth Proportional to 3,978.86, 5,971.54 and 2,031.62

Step by Step Solution

1. Step 1: Write the proportion equation
   3,978.86 : 5,971.54 = 2,031.62 : x
2. Step 2: Convert to fraction form
   3,978.86/5,971.54 = 2,031.62/x
3. Step 3: Cross multiply
   3,978.86x = 5,971.54 × 2,031.62
4. Step 4: Simplify right side
   3,978.86x = 12,131,900.09
5. Step 5: Solve for x
   x = 12,131,900.09/3,978.86
6. Step 6: Final answer
   x = 3,049.09