Finding the Fourth Proportional to 1,579.89, 2,180.16 and 881.31

Step by Step Solution

1. Step 1: Write the proportion equation
   1,579.89 : 2,180.16 = 881.31 : x
2. Step 2: Convert to fraction form
   1,579.89/2,180.16 = 881.31/x
3. Step 3: Cross multiply
   1,579.89x = 2,180.16 × 881.31
4. Step 4: Simplify right side
   1,579.89x = 1,921,396.81
5. Step 5: Solve for x
   x = 1,921,396.81/1,579.89
6. Step 6: Final answer
   x = 1,216.16