Finding the Fourth Proportional to 2,216.27, 3,058.34 and 1,221.59

Step by Step Solution

1. Step 1: Write the proportion equation
   2,216.27 : 3,058.34 = 1,221.59 : x
2. Step 2: Convert to fraction form
   2,216.27/3,058.34 = 1,221.59/x
3. Step 3: Cross multiply
   2,216.27x = 3,058.34 × 1,221.59
4. Step 4: Simplify right side
   2,216.27x = 3,736,037.56
5. Step 5: Solve for x
   x = 3,736,037.56/2,216.27
6. Step 6: Final answer
   x = 1,685.73