Finding the Fourth Proportional to 1,017.12, 1,524.72 and 693.28

Step by Step Solution

1. Step 1: Write the proportion equation
   1,017.12 : 1,524.72 = 693.28 : x
2. Step 2: Convert to fraction form
   1,017.12/1,524.72 = 693.28/x
3. Step 3: Cross multiply
   1,017.12x = 1,524.72 × 693.28
4. Step 4: Simplify right side
   1,017.12x = 1,057,057.88
5. Step 5: Solve for x
   x = 1,057,057.88/1,017.12
6. Step 6: Final answer
   x = 1,039.27