Finding the Fourth Proportional to 2,216.56, 3,058.82 and 1,221.94

Step by Step Solution

1. Step 1: Write the proportion equation
   2,216.56 : 3,058.82 = 1,221.94 : x
2. Step 2: Convert to fraction form
   2,216.56/3,058.82 = 1,221.94/x
3. Step 3: Cross multiply
   2,216.56x = 3,058.82 × 1,221.94
4. Step 4: Simplify right side
   2,216.56x = 3,737,694.51
5. Step 5: Solve for x
   x = 3,737,694.51/2,216.56
6. Step 6: Final answer
   x = 1,686.26