Finding the Fourth Proportional to 2,172.56, 3,259.80 and 1,019.28

Step by Step Solution

1. Step 1: Write the proportion equation
   2,172.56 : 3,259.80 = 1,019.28 : x
2. Step 2: Convert to fraction form
   2,172.56/3,259.80 = 1,019.28/x
3. Step 3: Cross multiply
   2,172.56x = 3,259.80 × 1,019.28
4. Step 4: Simplify right side
   2,172.56x = 3,322,648.94
5. Step 5: Solve for x
   x = 3,322,648.94/2,172.56
6. Step 6: Final answer
   x = 1,529.37