Finding the Fourth Proportional to 2,160.52, 2,981.42 and 1,216.44

Step by Step Solution

1. Step 1: Write the proportion equation
   2,160.52 : 2,981.42 = 1,216.44 : x
2. Step 2: Convert to fraction form
   2,160.52/2,981.42 = 1,216.44/x
3. Step 3: Cross multiply
   2,160.52x = 2,981.42 × 1,216.44
4. Step 4: Simplify right side
   2,160.52x = 3,626,718.54
5. Step 5: Solve for x
   x = 3,626,718.54/2,160.52
6. Step 6: Final answer
   x = 1,678.63