Finding the Fourth Proportional to 1,446.12, 1,994.31 and 1,085.78

Step by Step Solution

1. Step 1: Write the proportion equation
   1,446.12 : 1,994.31 = 1,085.78 : x
2. Step 2: Convert to fraction form
   1,446.12/1,994.31 = 1,085.78/x
3. Step 3: Cross multiply
   1,446.12x = 1,994.31 × 1,085.78
4. Step 4: Simplify right side
   1,446.12x = 2,165,371.94
5. Step 5: Solve for x
   x = 2,165,371.94/1,446.12
6. Step 6: Final answer
   x = 1,497.37