Finding the Fourth Proportional to 2,221.78, 3,066.09 and 1,227.15

Step by Step Solution

1. Step 1: Write the proportion equation
   2,221.78 : 3,066.09 = 1,227.15 : x
2. Step 2: Convert to fraction form
   2,221.78/3,066.09 = 1,227.15/x
3. Step 3: Cross multiply
   2,221.78x = 3,066.09 × 1,227.15
4. Step 4: Simplify right side
   2,221.78x = 3,762,552.34
5. Step 5: Solve for x
   x = 3,762,552.34/2,221.78
6. Step 6: Final answer
   x = 1,693.49