Finding the Fourth Proportional to 1,243.25, 1,715.61 and 683.69

Step by Step Solution

1. Step 1: Write the proportion equation
   1,243.25 : 1,715.61 = 683.69 : x
2. Step 2: Convert to fraction form
   1,243.25/1,715.61 = 683.69/x
3. Step 3: Cross multiply
   1,243.25x = 1,715.61 × 683.69
4. Step 4: Simplify right side
   1,243.25x = 1,172,945.40
5. Step 5: Solve for x
   x = 1,172,945.40/1,243.25
6. Step 6: Final answer
   x = 943.45