Finding the Fourth Proportional to 2,215.71, 3,057.71 and 1,220.94

Step by Step Solution

1. Step 1: Write the proportion equation
   2,215.71 : 3,057.71 = 1,220.94 : x
2. Step 2: Convert to fraction form
   2,215.71/3,057.71 = 1,220.94/x
3. Step 3: Cross multiply
   2,215.71x = 3,057.71 × 1,220.94
4. Step 4: Simplify right side
   2,215.71x = 3,733,274.34
5. Step 5: Solve for x
   x = 3,733,274.34/2,215.71
6. Step 6: Final answer
   x = 1,684.91