Finding the Fourth Proportional to 1,439.83, 1,986.82 and 880.43

Step by Step Solution

1. Step 1: Write the proportion equation
   1,439.83 : 1,986.82 = 880.43 : x
2. Step 2: Convert to fraction form
   1,439.83/1,986.82 = 880.43/x
3. Step 3: Cross multiply
   1,439.83x = 1,986.82 × 880.43
4. Step 4: Simplify right side
   1,439.83x = 1,749,255.93
5. Step 5: Solve for x
   x = 1,749,255.93/1,439.83
6. Step 6: Final answer
   x = 1,214.90