Finding the Fourth Proportional to 1,661.56, 2,480.45 and 1,603.91

Step by Step Solution

1. Step 1: Write the proportion equation
   1,661.56 : 2,480.45 = 1,603.91 : x
2. Step 2: Convert to fraction form
   1,661.56/2,480.45 = 1,603.91/x
3. Step 3: Cross multiply
   1,661.56x = 2,480.45 × 1,603.91
4. Step 4: Simplify right side
   1,661.56x = 3,978,416.74
5. Step 5: Solve for x
   x = 3,978,416.74/1,661.56
6. Step 6: Final answer
   x = 2,394.39