Finding the Fourth Proportional to 1,439.89, 1,986.99 and 881.29

Step by Step Solution

1. Step 1: Write the proportion equation
   1,439.89 : 1,986.99 = 881.29 : x
2. Step 2: Convert to fraction form
   1,439.89/1,986.99 = 881.29/x
3. Step 3: Cross multiply
   1,439.89x = 1,986.99 × 881.29
4. Step 4: Simplify right side
   1,439.89x = 1,751,104.48
5. Step 5: Solve for x
   x = 1,751,104.48/1,439.89
6. Step 6: Final answer
   x = 1,216.14