Finding the Fourth Proportional to 1,409.39, 2,112.59 and 677.42

Step by Step Solution

1. Step 1: Write the proportion equation
   1,409.39 : 2,112.59 = 677.42 : x
2. Step 2: Convert to fraction form
   1,409.39/2,112.59 = 677.42/x
3. Step 3: Cross multiply
   1,409.39x = 2,112.59 × 677.42
4. Step 4: Simplify right side
   1,409.39x = 1,431,101.85
5. Step 5: Solve for x
   x = 1,431,101.85/1,409.39
6. Step 6: Final answer
   x = 1,015.41