Finding the Fourth Proportional to 2,216.45, 3,058.83 and 1,221.72

Step by Step Solution

1. Step 1: Write the proportion equation
   2,216.45 : 3,058.83 = 1,221.72 : x
2. Step 2: Convert to fraction form
   2,216.45/3,058.83 = 1,221.72/x
3. Step 3: Cross multiply
   2,216.45x = 3,058.83 × 1,221.72
4. Step 4: Simplify right side
   2,216.45x = 3,737,049.84
5. Step 5: Solve for x
   x = 3,737,049.84/2,216.45
6. Step 6: Final answer
   x = 1,686.05