Finding the Fourth Proportional to 1,092.58, 1,636.38 and 658.78

Step by Step Solution

1. Step 1: Write the proportion equation
   1,092.58 : 1,636.38 = 658.78 : x
2. Step 2: Convert to fraction form
   1,092.58/1,636.38 = 658.78/x
3. Step 3: Cross multiply
   1,092.58x = 1,636.38 × 658.78
4. Step 4: Simplify right side
   1,092.58x = 1,078,014.42
5. Step 5: Solve for x
   x = 1,078,014.42/1,092.58
6. Step 6: Final answer
   x = 986.67