Finding the Fourth Proportional to 2,160.24, 2,981.42 and 1,216.22

Step by Step Solution

1. Step 1: Write the proportion equation
   2,160.24 : 2,981.42 = 1,216.22 : x
2. Step 2: Convert to fraction form
   2,160.24/2,981.42 = 1,216.22/x
3. Step 3: Cross multiply
   2,160.24x = 2,981.42 × 1,216.22
4. Step 4: Simplify right side
   2,160.24x = 3,626,042.78
5. Step 5: Solve for x
   x = 3,626,042.78/2,160.24
6. Step 6: Final answer
   x = 1,678.54