Finding the Fourth Proportional to 1,661.50, 2,292.78 and 998.23

Step by Step Solution

1. Step 1: Write the proportion equation
   1,661.50 : 2,292.78 = 998.23 : x
2. Step 2: Convert to fraction form
   1,661.50/2,292.78 = 998.23/x
3. Step 3: Cross multiply
   1,661.50x = 2,292.78 × 998.23
4. Step 4: Simplify right side
   1,661.50x = 2,288,721.78
5. Step 5: Solve for x
   x = 2,288,721.78/1,661.50
6. Step 6: Final answer
   x = 1,377.50