Finding the Fourth Proportional to 1,105.67, 1,525.43 and 685.59

Step by Step Solution

1. Step 1: Write the proportion equation
   1,105.67 : 1,525.43 = 685.59 : x
2. Step 2: Convert to fraction form
   1,105.67/1,525.43 = 685.59/x
3. Step 3: Cross multiply
   1,105.67x = 1,525.43 × 685.59
4. Step 4: Simplify right side
   1,105.67x = 1,045,819.55
5. Step 5: Solve for x
   x = 1,045,819.55/1,105.67
6. Step 6: Final answer
   x = 945.87