Finding the Fourth Proportional to 1,128.40, 1,547.23 and 1,017.42

Step by Step Solution

1. Step 1: Write the proportion equation
   1,128.40 : 1,547.23 = 1,017.42 : x
2. Step 2: Convert to fraction form
   1,128.40/1,547.23 = 1,017.42/x
3. Step 3: Cross multiply
   1,128.40x = 1,547.23 × 1,017.42
4. Step 4: Simplify right side
   1,128.40x = 1,574,182.75
5. Step 5: Solve for x
   x = 1,574,182.75/1,128.40
6. Step 6: Final answer
   x = 1,395.06