Finding the Fourth Proportional to 2,216.37, 3,058.72 and 1,221.86

Step by Step Solution

1. Step 1: Write the proportion equation
   2,216.37 : 3,058.72 = 1,221.86 : x
2. Step 2: Convert to fraction form
   2,216.37/3,058.72 = 1,221.86/x
3. Step 3: Cross multiply
   2,216.37x = 3,058.72 × 1,221.86
4. Step 4: Simplify right side
   2,216.37x = 3,737,327.62
5. Step 5: Solve for x
   x = 3,737,327.62/2,216.37
6. Step 6: Final answer
   x = 1,686.24