Finding the Fourth Proportional to 1,809.96, 2,500.38 and 1,223.07

Step by Step Solution

1. Step 1: Write the proportion equation
   1,809.96 : 2,500.38 = 1,223.07 : x
2. Step 2: Convert to fraction form
   1,809.96/2,500.38 = 1,223.07/x
3. Step 3: Cross multiply
   1,809.96x = 2,500.38 × 1,223.07
4. Step 4: Simplify right side
   1,809.96x = 3,058,139.77
5. Step 5: Solve for x
   x = 3,058,139.77/1,809.96
6. Step 6: Final answer
   x = 1,689.62