Finding the Fourth Proportional to 3,980.78, 5,966.66 and 2,028.86

Step by Step Solution

1. Step 1: Write the proportion equation
   3,980.78 : 5,966.66 = 2,028.86 : x
2. Step 2: Convert to fraction form
   3,980.78/5,966.66 = 2,028.86/x
3. Step 3: Cross multiply
   3,980.78x = 5,966.66 × 2,028.86
4. Step 4: Simplify right side
   3,980.78x = 12,105,517.81
5. Step 5: Solve for x
   x = 12,105,517.81/3,980.78
6. Step 6: Final answer
   x = 3,040.99