Finding the Fourth Proportional to 3,980.83, 5,493.41 and 2,188.31

Step by Step Solution

1. Step 1: Write the proportion equation
   3,980.83 : 5,493.41 = 2,188.31 : x
2. Step 2: Convert to fraction form
   3,980.83/5,493.41 = 2,188.31/x
3. Step 3: Cross multiply
   3,980.83x = 5,493.41 × 2,188.31
4. Step 4: Simplify right side
   3,980.83x = 12,021,284.04
5. Step 5: Solve for x
   x = 12,021,284.04/3,980.83
6. Step 6: Final answer
   x = 3,019.79