Finding the Fourth Proportional to 2,216.51, 3,058.81 and 1,221.82

Step by Step Solution

1. Step 1: Write the proportion equation
   2,216.51 : 3,058.81 = 1,221.82 : x
2. Step 2: Convert to fraction form
   2,216.51/3,058.81 = 1,221.82/x
3. Step 3: Cross multiply
   2,216.51x = 3,058.81 × 1,221.82
4. Step 4: Simplify right side
   2,216.51x = 3,737,315.23
5. Step 5: Solve for x
   x = 3,737,315.23/2,216.51
6. Step 6: Final answer
   x = 1,686.13