Finding the Fourth Proportional to 1,105.54, 1,525.20 and 685.74

Step by Step Solution

1. Step 1: Write the proportion equation
   1,105.54 : 1,525.20 = 685.74 : x
2. Step 2: Convert to fraction form
   1,105.54/1,525.20 = 685.74/x
3. Step 3: Cross multiply
   1,105.54x = 1,525.20 × 685.74
4. Step 4: Simplify right side
   1,105.54x = 1,045,890.65
5. Step 5: Solve for x
   x = 1,045,890.65/1,105.54
6. Step 6: Final answer
   x = 946.05