Finding the Fourth Proportional to 2,143.92, 2,959.18 and 1,645.76

Step by Step Solution

1. Step 1: Write the proportion equation
   2,143.92 : 2,959.18 = 1,645.76 : x
2. Step 2: Convert to fraction form
   2,143.92/2,959.18 = 1,645.76/x
3. Step 3: Cross multiply
   2,143.92x = 2,959.18 × 1,645.76
4. Step 4: Simplify right side
   2,143.92x = 4,870,100.08
5. Step 5: Solve for x
   x = 4,870,100.08/2,143.92
6. Step 6: Final answer
   x = 2,271.59