Finding the Fourth Proportional to 1,661.48, 2,291.38 and 998.09

Step by Step Solution

1. Step 1: Write the proportion equation
   1,661.48 : 2,291.38 = 998.09 : x
2. Step 2: Convert to fraction form
   1,661.48/2,291.38 = 998.09/x
3. Step 3: Cross multiply
   1,661.48x = 2,291.38 × 998.09
4. Step 4: Simplify right side
   1,661.48x = 2,287,003.46
5. Step 5: Solve for x
   x = 2,287,003.46/1,661.48
6. Step 6: Final answer
   x = 1,376.49