Finding the Fourth Proportional to 2,047.28, 2,825.20 and 1,115.76

Step by Step Solution

1. Step 1: Write the proportion equation
   2,047.28 : 2,825.20 = 1,115.76 : x
2. Step 2: Convert to fraction form
   2,047.28/2,825.20 = 1,115.76/x
3. Step 3: Cross multiply
   2,047.28x = 2,825.20 × 1,115.76
4. Step 4: Simplify right side
   2,047.28x = 3,152,245.15
5. Step 5: Solve for x
   x = 3,152,245.15/2,047.28
6. Step 6: Final answer
   x = 1,539.72