Finding the Fourth Proportional to 2,216.67, 3,058.98 and 1,221.93

Step by Step Solution

1. Step 1: Write the proportion equation
   2,216.67 : 3,058.98 = 1,221.93 : x
2. Step 2: Convert to fraction form
   2,216.67/3,058.98 = 1,221.93/x
3. Step 3: Cross multiply
   2,216.67x = 3,058.98 × 1,221.93
4. Step 4: Simplify right side
   2,216.67x = 3,737,859.43
5. Step 5: Solve for x
   x = 3,737,859.43/2,216.67
6. Step 6: Final answer
   x = 1,686.25