Finding the Fourth Proportional to 2,188.50, 3,019.35 and 1,443.21

Step by Step Solution

1. Step 1: Write the proportion equation
   2,188.50 : 3,019.35 = 1,443.21 : x
2. Step 2: Convert to fraction form
   2,188.50/3,019.35 = 1,443.21/x
3. Step 3: Cross multiply
   2,188.50x = 3,019.35 × 1,443.21
4. Step 4: Simplify right side
   2,188.50x = 4,357,556.11
5. Step 5: Solve for x
   x = 4,357,556.11/2,188.50
6. Step 6: Final answer
   x = 1,991.12