Finding the Fourth Proportional to 1,439.94, 1,986.84 and 880.53

Step by Step Solution

1. Step 1: Write the proportion equation
   1,439.94 : 1,986.84 = 880.53 : x
2. Step 2: Convert to fraction form
   1,439.94/1,986.84 = 880.53/x
3. Step 3: Cross multiply
   1,439.94x = 1,986.84 × 880.53
4. Step 4: Simplify right side
   1,439.94x = 1,749,472.23
5. Step 5: Solve for x
   x = 1,749,472.23/1,439.94
6. Step 6: Final answer
   x = 1,214.96