Finding the Fourth Proportional to 2,216.39, 3,321.81 and 1,121.04

Step by Step Solution

1. Step 1: Write the proportion equation
   2,216.39 : 3,321.81 = 1,121.04 : x
2. Step 2: Convert to fraction form
   2,216.39/3,321.81 = 1,121.04/x
3. Step 3: Cross multiply
   2,216.39x = 3,321.81 × 1,121.04
4. Step 4: Simplify right side
   2,216.39x = 3,723,881.88
5. Step 5: Solve for x
   x = 3,723,881.88/2,216.39
6. Step 6: Final answer
   x = 1,680.16