Finding the Fourth Proportional to 1,812.42, 2,499.53 and 1,223.75

Step by Step Solution

1. Step 1: Write the proportion equation
   1,812.42 : 2,499.53 = 1,223.75 : x
2. Step 2: Convert to fraction form
   1,812.42/2,499.53 = 1,223.75/x
3. Step 3: Cross multiply
   1,812.42x = 2,499.53 × 1,223.75
4. Step 4: Simplify right side
   1,812.42x = 3,058,809.15
5. Step 5: Solve for x
   x = 3,058,809.15/1,812.42
6. Step 6: Final answer
   x = 1,687.69