Finding the Fourth Proportional to 1,182.55, 1,631.91 and 685.47

Step by Step Solution

1. Step 1: Write the proportion equation
   1,182.55 : 1,631.91 = 685.47 : x
2. Step 2: Convert to fraction form
   1,182.55/1,631.91 = 685.47/x
3. Step 3: Cross multiply
   1,182.55x = 1,631.91 × 685.47
4. Step 4: Simplify right side
   1,182.55x = 1,118,631.22
5. Step 5: Solve for x
   x = 1,118,631.22/1,182.55
6. Step 6: Final answer
   x = 945.95