Finding the Fourth Proportional to 1,440.46, 1,986.78 and 880.48

Step by Step Solution

1. Step 1: Write the proportion equation
   1,440.46 : 1,986.78 = 880.48 : x
2. Step 2: Convert to fraction form
   1,440.46/1,986.78 = 880.48/x
3. Step 3: Cross multiply
   1,440.46x = 1,986.78 × 880.48
4. Step 4: Simplify right side
   1,440.46x = 1,749,320.05
5. Step 5: Solve for x
   x = 1,749,320.05/1,440.46
6. Step 6: Final answer
   x = 1,214.42