Finding the Fourth Proportional to 1,605.42, 2,409.55 and 1,118.81

Step by Step Solution

1. Step 1: Write the proportion equation
   1,605.42 : 2,409.55 = 1,118.81 : x
2. Step 2: Convert to fraction form
   1,605.42/2,409.55 = 1,118.81/x
3. Step 3: Cross multiply
   1,605.42x = 2,409.55 × 1,118.81
4. Step 4: Simplify right side
   1,605.42x = 2,695,831.86
5. Step 5: Solve for x
   x = 2,695,831.86/1,605.42
6. Step 6: Final answer
   x = 1,679.21