Finding the Fourth Proportional to 1,182.20, 1,631.56 and 684.81

Step by Step Solution

1. Step 1: Write the proportion equation
   1,182.20 : 1,631.56 = 684.81 : x
2. Step 2: Convert to fraction form
   1,182.20/1,631.56 = 684.81/x
3. Step 3: Cross multiply
   1,182.20x = 1,631.56 × 684.81
4. Step 4: Simplify right side
   1,182.20x = 1,117,306.89
5. Step 5: Solve for x
   x = 1,117,306.89/1,182.20
6. Step 6: Final answer
   x = 945.11