Finding the Fourth Proportional to 2,215.27, 3,057.11 and 1,220.59

Step by Step Solution

1. Step 1: Write the proportion equation
   2,215.27 : 3,057.11 = 1,220.59 : x
2. Step 2: Convert to fraction form
   2,215.27/3,057.11 = 1,220.59/x
3. Step 3: Cross multiply
   2,215.27x = 3,057.11 × 1,220.59
4. Step 4: Simplify right side
   2,215.27x = 3,731,477.89
5. Step 5: Solve for x
   x = 3,731,477.89/2,215.27
6. Step 6: Final answer
   x = 1,684.43