Finding the Fourth Proportional to 1,092.69, 1,631.72 and 858.95

Step by Step Solution

1. Step 1: Write the proportion equation
   1,092.69 : 1,631.72 = 858.95 : x
2. Step 2: Convert to fraction form
   1,092.69/1,631.72 = 858.95/x
3. Step 3: Cross multiply
   1,092.69x = 1,631.72 × 858.95
4. Step 4: Simplify right side
   1,092.69x = 1,401,572.76
5. Step 5: Solve for x
   x = 1,401,572.76/1,092.69
6. Step 6: Final answer
   x = 1,282.68