Finding the Fourth Proportional to 1,092.82, 1,636.15 and 860.45

Step by Step Solution

1. Step 1: Write the proportion equation
   1,092.82 : 1,636.15 = 860.45 : x
2. Step 2: Convert to fraction form
   1,092.82/1,636.15 = 860.45/x
3. Step 3: Cross multiply
   1,092.82x = 1,636.15 × 860.45
4. Step 4: Simplify right side
   1,092.82x = 1,407,821.15
5. Step 5: Solve for x
   x = 1,407,821.15/1,092.82
6. Step 6: Final answer
   x = 1,288.25