Finding the Fourth Proportional to 1,182.28, 1,631.91 and 685.05

Step by Step Solution

1. Step 1: Write the proportion equation
   1,182.28 : 1,631.91 = 685.05 : x
2. Step 2: Convert to fraction form
   1,182.28/1,631.91 = 685.05/x
3. Step 3: Cross multiply
   1,182.28x = 1,631.91 × 685.05
4. Step 4: Simplify right side
   1,182.28x = 1,117,939.95
5. Step 5: Solve for x
   x = 1,117,939.95/1,182.28
6. Step 6: Final answer
   x = 945.58