Finding the Fourth Proportional to 1,017.06, 1,403.55 and 551.31

Step by Step Solution

1. Step 1: Write the proportion equation
   1,017.06 : 1,403.55 = 551.31 : x
2. Step 2: Convert to fraction form
   1,017.06/1,403.55 = 551.31/x
3. Step 3: Cross multiply
   1,017.06x = 1,403.55 × 551.31
4. Step 4: Simplify right side
   1,017.06x = 773,791.15
5. Step 5: Solve for x
   x = 773,791.15/1,017.06
6. Step 6: Final answer
   x = 760.81