Finding the Fourth Proportional to 2,143.88, 2,958.28 and 1,199.71

Step by Step Solution

1. Step 1: Write the proportion equation
   2,143.88 : 2,958.28 = 1,199.71 : x
2. Step 2: Convert to fraction form
   2,143.88/2,958.28 = 1,199.71/x
3. Step 3: Cross multiply
   2,143.88x = 2,958.28 × 1,199.71
4. Step 4: Simplify right side
   2,143.88x = 3,549,078.10
5. Step 5: Solve for x
   x = 3,549,078.10/2,143.88
6. Step 6: Final answer
   x = 1,655.45