Finding the Fourth Proportional to 2,188.53, 3,284.06 and 1,311.30

Step by Step Solution

1. Step 1: Write the proportion equation
   2,188.53 : 3,284.06 = 1,311.30 : x
2. Step 2: Convert to fraction form
   2,188.53/3,284.06 = 1,311.30/x
3. Step 3: Cross multiply
   2,188.53x = 3,284.06 × 1,311.30
4. Step 4: Simplify right side
   2,188.53x = 4,306,381.32
5. Step 5: Solve for x
   x = 4,306,381.32/2,188.53
6. Step 6: Final answer
   x = 1,967.70