Finding the Fourth Proportional to 2,216.26, 3,058.61 and 1,221.71

Step by Step Solution

1. Step 1: Write the proportion equation
   2,216.26 : 3,058.61 = 1,221.71 : x
2. Step 2: Convert to fraction form
   2,216.26/3,058.61 = 1,221.71/x
3. Step 3: Cross multiply
   2,216.26x = 3,058.61 × 1,221.71
4. Step 4: Simplify right side
   2,216.26x = 3,736,734.42
5. Step 5: Solve for x
   x = 3,736,734.42/2,216.26
6. Step 6: Final answer
   x = 1,686.05