Finding the Fourth Proportional to 2,229.39, 3,076.53 and 1,221.12

Step by Step Solution

1. Step 1: Write the proportion equation
   2,229.39 : 3,076.53 = 1,221.12 : x
2. Step 2: Convert to fraction form
   2,229.39/3,076.53 = 1,221.12/x
3. Step 3: Cross multiply
   2,229.39x = 3,076.53 × 1,221.12
4. Step 4: Simplify right side
   2,229.39x = 3,756,812.31
5. Step 5: Solve for x
   x = 3,756,812.31/2,229.39
6. Step 6: Final answer
   x = 1,685.13