Finding the Fourth Proportional to 1,245.54, 1,718.82 and 686.04

Step by Step Solution

1. Step 1: Write the proportion equation
   1,245.54 : 1,718.82 = 686.04 : x
2. Step 2: Convert to fraction form
   1,245.54/1,718.82 = 686.04/x
3. Step 3: Cross multiply
   1,245.54x = 1,718.82 × 686.04
4. Step 4: Simplify right side
   1,245.54x = 1,179,179.27
5. Step 5: Solve for x
   x = 1,179,179.27/1,245.54
6. Step 6: Final answer
   x = 946.72