Finding the Fourth Proportional to 2,456.90, 3,686.05 and 1,223.99

Step by Step Solution

1. Step 1: Write the proportion equation
   2,456.90 : 3,686.05 = 1,223.99 : x
2. Step 2: Convert to fraction form
   2,456.90/3,686.05 = 1,223.99/x
3. Step 3: Cross multiply
   2,456.90x = 3,686.05 × 1,223.99
4. Step 4: Simplify right side
   2,456.90x = 4,511,666.85
5. Step 5: Solve for x
   x = 4,511,666.85/2,456.90
6. Step 6: Final answer
   x = 1,836.33