Finding the Fourth Proportional to 2,144.21, 2,959.88 and 1,398.83

Step by Step Solution

1. Step 1: Write the proportion equation
   2,144.21 : 2,959.88 = 1,398.83 : x
2. Step 2: Convert to fraction form
   2,144.21/2,959.88 = 1,398.83/x
3. Step 3: Cross multiply
   2,144.21x = 2,959.88 × 1,398.83
4. Step 4: Simplify right side
   2,144.21x = 4,140,347.15
5. Step 5: Solve for x
   x = 4,140,347.15/2,144.21
6. Step 6: Final answer
   x = 1,930.95