Finding the Fourth Proportional to 2,216.18, 3,058.22 and 1,221.43

Step by Step Solution

1. Step 1: Write the proportion equation
   2,216.18 : 3,058.22 = 1,221.43 : x
2. Step 2: Convert to fraction form
   2,216.18/3,058.22 = 1,221.43/x
3. Step 3: Cross multiply
   2,216.18x = 3,058.22 × 1,221.43
4. Step 4: Simplify right side
   2,216.18x = 3,735,401.65
5. Step 5: Solve for x
   x = 3,735,401.65/2,216.18
6. Step 6: Final answer
   x = 1,685.51