Finding the Fourth Proportional to 1,017.17, 1,403.69 and 551.42

Step by Step Solution

1. Step 1: Write the proportion equation
   1,017.17 : 1,403.69 = 551.42 : x
2. Step 2: Convert to fraction form
   1,017.17/1,403.69 = 551.42/x
3. Step 3: Cross multiply
   1,017.17x = 1,403.69 × 551.42
4. Step 4: Simplify right side
   1,017.17x = 774,022.74
5. Step 5: Solve for x
   x = 774,022.74/1,017.17
6. Step 6: Final answer
   x = 760.96