Finding the Fourth Proportional to 1,105.47, 1,525.17 and 685.67

Step by Step Solution

1. Step 1: Write the proportion equation
   1,105.47 : 1,525.17 = 685.67 : x
2. Step 2: Convert to fraction form
   1,105.47/1,525.17 = 685.67/x
3. Step 3: Cross multiply
   1,105.47x = 1,525.17 × 685.67
4. Step 4: Simplify right side
   1,105.47x = 1,045,756.76
5. Step 5: Solve for x
   x = 1,045,756.76/1,105.47
6. Step 6: Final answer
   x = 945.99