Finding the Fourth Proportional to 1,579.98, 2,180.35 and 871.89

Step by Step Solution

1. Step 1: Write the proportion equation
   1,579.98 : 2,180.35 = 871.89 : x
2. Step 2: Convert to fraction form
   1,579.98/2,180.35 = 871.89/x
3. Step 3: Cross multiply
   1,579.98x = 2,180.35 × 871.89
4. Step 4: Simplify right side
   1,579.98x = 1,901,026.45
5. Step 5: Solve for x
   x = 1,901,026.45/1,579.98
6. Step 6: Final answer
   x = 1,203.20