Finding the Fourth Proportional to 1,578.72, 2,179.71 and 1,020.54

Step by Step Solution

1. Step 1: Write the proportion equation
   1,578.72 : 2,179.71 = 1,020.54 : x
2. Step 2: Convert to fraction form
   1,578.72/2,179.71 = 1,020.54/x
3. Step 3: Cross multiply
   1,578.72x = 2,179.71 × 1,020.54
4. Step 4: Simplify right side
   1,578.72x = 2,224,481.24
5. Step 5: Solve for x
   x = 2,224,481.24/1,578.72
6. Step 6: Final answer
   x = 1,409.04