Finding the Fourth Proportional to 1,615.28, 2,228.31 and 1,017.50

Step by Step Solution

1. Step 1: Write the proportion equation
   1,615.28 : 2,228.31 = 1,017.50 : x
2. Step 2: Convert to fraction form
   1,615.28/2,228.31 = 1,017.50/x
3. Step 3: Cross multiply
   1,615.28x = 2,228.31 × 1,017.50
4. Step 4: Simplify right side
   1,615.28x = 2,267,294.28
5. Step 5: Solve for x
   x = 2,267,294.28/1,615.28
6. Step 6: Final answer
   x = 1,403.66