Finding the Fourth Proportional to 1,111.27, 1,534.31 and 858.73

Step by Step Solution

1. Step 1: Write the proportion equation
   1,111.27 : 1,534.31 = 858.73 : x
2. Step 2: Convert to fraction form
   1,111.27/1,534.31 = 858.73/x
3. Step 3: Cross multiply
   1,111.27x = 1,534.31 × 858.73
4. Step 4: Simplify right side
   1,111.27x = 1,317,553.73
5. Step 5: Solve for x
   x = 1,317,553.73/1,111.27
6. Step 6: Final answer
   x = 1,185.63