Finding the Fourth Proportional to 1,813.97, 2,499.42 and 1,223.48

Step by Step Solution

1. Step 1: Write the proportion equation
   1,813.97 : 2,499.42 = 1,223.48 : x
2. Step 2: Convert to fraction form
   1,813.97/2,499.42 = 1,223.48/x
3. Step 3: Cross multiply
   1,813.97x = 2,499.42 × 1,223.48
4. Step 4: Simplify right side
   1,813.97x = 3,057,990.38
5. Step 5: Solve for x
   x = 3,057,990.38/1,813.97
6. Step 6: Final answer
   x = 1,685.80