Finding the Fourth Proportional to 2,214.88, 3,056.51 and 1,220.15

Step by Step Solution

1. Step 1: Write the proportion equation
   2,214.88 : 3,056.51 = 1,220.15 : x
2. Step 2: Convert to fraction form
   2,214.88/3,056.51 = 1,220.15/x
3. Step 3: Cross multiply
   2,214.88x = 3,056.51 × 1,220.15
4. Step 4: Simplify right side
   2,214.88x = 3,729,411.37
5. Step 5: Solve for x
   x = 3,729,411.37/2,214.88
6. Step 6: Final answer
   x = 1,683.80