Finding the Fourth Proportional to 1,017.72, 1,404.45 and 551.97

Step by Step Solution

1. Step 1: Write the proportion equation
   1,017.72 : 1,404.45 = 551.97 : x
2. Step 2: Convert to fraction form
   1,017.72/1,404.45 = 551.97/x
3. Step 3: Cross multiply
   1,017.72x = 1,404.45 × 551.97
4. Step 4: Simplify right side
   1,017.72x = 775,214.27
5. Step 5: Solve for x
   x = 775,214.27/1,017.72
6. Step 6: Final answer
   x = 761.72