Finding the Fourth Proportional to 1,781.69, 2,456.83 and 1,222.97

Step by Step Solution

1. Step 1: Write the proportion equation
   1,781.69 : 2,456.83 = 1,222.97 : x
2. Step 2: Convert to fraction form
   1,781.69/2,456.83 = 1,222.97/x
3. Step 3: Cross multiply
   1,781.69x = 2,456.83 × 1,222.97
4. Step 4: Simplify right side
   1,781.69x = 3,004,618.63
5. Step 5: Solve for x
   x = 3,004,618.63/1,781.69
6. Step 6: Final answer
   x = 1,686.39