Finding the Fourth Proportional to 3,980.86, 5,493.66 and 2,188.42

Step by Step Solution

1. Step 1: Write the proportion equation
   3,980.86 : 5,493.66 = 2,188.42 : x
2. Step 2: Convert to fraction form
   3,980.86/5,493.66 = 2,188.42/x
3. Step 3: Cross multiply
   3,980.86x = 5,493.66 × 2,188.42
4. Step 4: Simplify right side
   3,980.86x = 12,022,435.42
5. Step 5: Solve for x
   x = 12,022,435.42/3,980.86
6. Step 6: Final answer
   x = 3,020.06