Finding the Fourth Proportional to 1,813.98, 2,499.41 and 1,223.48

Step by Step Solution

1. Step 1: Write the proportion equation
   1,813.98 : 2,499.41 = 1,223.48 : x
2. Step 2: Convert to fraction form
   1,813.98/2,499.41 = 1,223.48/x
3. Step 3: Cross multiply
   1,813.98x = 2,499.41 × 1,223.48
4. Step 4: Simplify right side
   1,813.98x = 3,057,978.15
5. Step 5: Solve for x
   x = 3,057,978.15/1,813.98
6. Step 6: Final answer
   x = 1,685.78