Finding the Fourth Proportional to 3,519.72, 5,279.56 and 1,054.54

Step by Step Solution

1. Step 1: Write the proportion equation
   3,519.72 : 5,279.56 = 1,054.54 : x
2. Step 2: Convert to fraction form
   3,519.72/5,279.56 = 1,054.54/x
3. Step 3: Cross multiply
   3,519.72x = 5,279.56 × 1,054.54
4. Step 4: Simplify right side
   3,519.72x = 5,567,507.20
5. Step 5: Solve for x
   x = 5,567,507.20/3,519.72
6. Step 6: Final answer
   x = 1,581.80