Finding the Fourth Proportional to 2,092.23, 3,136.52 and 858.78

Step by Step Solution

1. Step 1: Write the proportion equation
   2,092.23 : 3,136.52 = 858.78 : x
2. Step 2: Convert to fraction form
   2,092.23/3,136.52 = 858.78/x
3. Step 3: Cross multiply
   2,092.23x = 3,136.52 × 858.78
4. Step 4: Simplify right side
   2,092.23x = 2,693,573.97
5. Step 5: Solve for x
   x = 2,693,573.97/2,092.23
6. Step 6: Final answer
   x = 1,287.42