Finding the Fourth Proportional to 2,143.50, 2,958.06 and 1,315.50

Step by Step Solution

1. Step 1: Write the proportion equation
   2,143.50 : 2,958.06 = 1,315.50 : x
2. Step 2: Convert to fraction form
   2,143.50/2,958.06 = 1,315.50/x
3. Step 3: Cross multiply
   2,143.50x = 2,958.06 × 1,315.50
4. Step 4: Simplify right side
   2,143.50x = 3,891,327.93
5. Step 5: Solve for x
   x = 3,891,327.93/2,143.50
6. Step 6: Final answer
   x = 1,815.41