Finding the Fourth Proportional to 2,216.43, 3,058.63 and 1,221.71

Step by Step Solution

1. Step 1: Write the proportion equation
   2,216.43 : 3,058.63 = 1,221.71 : x
2. Step 2: Convert to fraction form
   2,216.43/3,058.63 = 1,221.71/x
3. Step 3: Cross multiply
   2,216.43x = 3,058.63 × 1,221.71
4. Step 4: Simplify right side
   2,216.43x = 3,736,740.51
5. Step 5: Solve for x
   x = 3,736,740.51/2,216.43
6. Step 6: Final answer
   x = 1,685.93