Finding the Fourth Proportional to 1,046.72, 1,446.24 and 878.48

Step by Step Solution

1. Step 1: Write the proportion equation
   1,046.72 : 1,446.24 = 878.48 : x
2. Step 2: Convert to fraction form
   1,046.72/1,446.24 = 878.48/x
3. Step 3: Cross multiply
   1,046.72x = 1,446.24 × 878.48
4. Step 4: Simplify right side
   1,046.72x = 1,270,492.92
5. Step 5: Solve for x
   x = 1,270,492.92/1,046.72
6. Step 6: Final answer
   x = 1,213.78