Finding the Fourth Proportional to 2,215.82, 3,057.62 and 1,221.14

Step by Step Solution

1. Step 1: Write the proportion equation
   2,215.82 : 3,057.62 = 1,221.14 : x
2. Step 2: Convert to fraction form
   2,215.82/3,057.62 = 1,221.14/x
3. Step 3: Cross multiply
   2,215.82x = 3,057.62 × 1,221.14
4. Step 4: Simplify right side
   2,215.82x = 3,733,782.09
5. Step 5: Solve for x
   x = 3,733,782.09/2,215.82
6. Step 6: Final answer
   x = 1,685.06