Finding the Fourth Proportional to 1,579.21, 2,179.32 and 871.05

Step by Step Solution

1. Step 1: Write the proportion equation
   1,579.21 : 2,179.32 = 871.05 : x
2. Step 2: Convert to fraction form
   1,579.21/2,179.32 = 871.05/x
3. Step 3: Cross multiply
   1,579.21x = 2,179.32 × 871.05
4. Step 4: Simplify right side
   1,579.21x = 1,898,296.69
5. Step 5: Solve for x
   x = 1,898,296.69/1,579.21
6. Step 6: Final answer
   x = 1,202.05