Finding the Fourth Proportional to 1,105.73, 1,525.61 and 685.88

Step by Step Solution

1. Step 1: Write the proportion equation
   1,105.73 : 1,525.61 = 685.88 : x
2. Step 2: Convert to fraction form
   1,105.73/1,525.61 = 685.88/x
3. Step 3: Cross multiply
   1,105.73x = 1,525.61 × 685.88
4. Step 4: Simplify right side
   1,105.73x = 1,046,381.96
5. Step 5: Solve for x
   x = 1,046,381.96/1,105.73
6. Step 6: Final answer
   x = 946.33