Finding the Fourth Proportional to 1,411.68, 1,947.20 and 1,019.28

Step by Step Solution

1. Step 1: Write the proportion equation
   1,411.68 : 1,947.20 = 1,019.28 : x
2. Step 2: Convert to fraction form
   1,411.68/1,947.20 = 1,019.28/x
3. Step 3: Cross multiply
   1,411.68x = 1,947.20 × 1,019.28
4. Step 4: Simplify right side
   1,411.68x = 1,984,742.02
5. Step 5: Solve for x
   x = 1,984,742.02/1,411.68
6. Step 6: Final answer
   x = 1,405.94