Finding the Fourth Proportional to 2,188.83, 3,284.06 and 1,311.96

Step by Step Solution

1. Step 1: Write the proportion equation
   2,188.83 : 3,284.06 = 1,311.96 : x
2. Step 2: Convert to fraction form
   2,188.83/3,284.06 = 1,311.96/x
3. Step 3: Cross multiply
   2,188.83x = 3,284.06 × 1,311.96
4. Step 4: Simplify right side
   2,188.83x = 4,308,540.78
5. Step 5: Solve for x
   x = 4,308,540.78/2,188.83
6. Step 6: Final answer
   x = 1,968.42