Finding the Fourth Proportional to 2,216.04, 3,058.20 and 1,221.33

Step by Step Solution

1. Step 1: Write the proportion equation
   2,216.04 : 3,058.20 = 1,221.33 : x
2. Step 2: Convert to fraction form
   2,216.04/3,058.20 = 1,221.33/x
3. Step 3: Cross multiply
   2,216.04x = 3,058.20 × 1,221.33
4. Step 4: Simplify right side
   2,216.04x = 3,735,071.41
5. Step 5: Solve for x
   x = 3,735,071.41/2,216.04
6. Step 6: Final answer
   x = 1,685.47