Finding the Fourth Proportional to 1,253.10, 1,728.58 and 1,017.31

Step by Step Solution

1. Step 1: Write the proportion equation
   1,253.10 : 1,728.58 = 1,017.31 : x
2. Step 2: Convert to fraction form
   1,253.10/1,728.58 = 1,017.31/x
3. Step 3: Cross multiply
   1,253.10x = 1,728.58 × 1,017.31
4. Step 4: Simplify right side
   1,253.10x = 1,758,501.72
5. Step 5: Solve for x
   x = 1,758,501.72/1,253.10
6. Step 6: Final answer
   x = 1,403.32