Finding the Fourth Proportional to 1,615.09, 2,228.06 and 1,017.31

Step by Step Solution

1. Step 1: Write the proportion equation
   1,615.09 : 2,228.06 = 1,017.31 : x
2. Step 2: Convert to fraction form
   1,615.09/2,228.06 = 1,017.31/x
3. Step 3: Cross multiply
   1,615.09x = 2,228.06 × 1,017.31
4. Step 4: Simplify right side
   1,615.09x = 2,266,627.72
5. Step 5: Solve for x
   x = 2,266,627.72/1,615.09
6. Step 6: Final answer
   x = 1,403.41