Finding the Fourth Proportional to 1,017.05, 1,403.52 and 551.30

Step by Step Solution

1. Step 1: Write the proportion equation
   1,017.05 : 1,403.52 = 551.30 : x
2. Step 2: Convert to fraction form
   1,017.05/1,403.52 = 551.30/x
3. Step 3: Cross multiply
   1,017.05x = 1,403.52 × 551.30
4. Step 4: Simplify right side
   1,017.05x = 773,760.58
5. Step 5: Solve for x
   x = 773,760.58/1,017.05
6. Step 6: Final answer
   x = 760.79