Finding the Fourth Proportional to 2,605.98, 3,909.42 and 1,145.28

Step by Step Solution

1. Step 1: Write the proportion equation
   2,605.98 : 3,909.42 = 1,145.28 : x
2. Step 2: Convert to fraction form
   2,605.98/3,909.42 = 1,145.28/x
3. Step 3: Cross multiply
   2,605.98x = 3,909.42 × 1,145.28
4. Step 4: Simplify right side
   2,605.98x = 4,477,380.54
5. Step 5: Solve for x
   x = 4,477,380.54/2,605.98
6. Step 6: Final answer
   x = 1,718.12