Finding the Fourth Proportional to 1,167.77, 1,751.78 and 551.31

Step by Step Solution

1. Step 1: Write the proportion equation
   1,167.77 : 1,751.78 = 551.31 : x
2. Step 2: Convert to fraction form
   1,167.77/1,751.78 = 551.31/x
3. Step 3: Cross multiply
   1,167.77x = 1,751.78 × 551.31
4. Step 4: Simplify right side
   1,167.77x = 965,773.83
5. Step 5: Solve for x
   x = 965,773.83/1,167.77
6. Step 6: Final answer
   x = 827.02