Finding the Fourth Proportional to 1,245.54, 1,866.82 and 551.42

Step by Step Solution

1. Step 1: Write the proportion equation
   1,245.54 : 1,866.82 = 551.42 : x
2. Step 2: Convert to fraction form
   1,245.54/1,866.82 = 551.42/x
3. Step 3: Cross multiply
   1,245.54x = 1,866.82 × 551.42
4. Step 4: Simplify right side
   1,245.54x = 1,029,401.88
5. Step 5: Solve for x
   x = 1,029,401.88/1,245.54
6. Step 6: Final answer
   x = 826.47