Finding the Fourth Proportional to 1,243.23, 1,715.59 and 683.72

Step by Step Solution

1. Step 1: Write the proportion equation
   1,243.23 : 1,715.59 = 683.72 : x
2. Step 2: Convert to fraction form
   1,243.23/1,715.59 = 683.72/x
3. Step 3: Cross multiply
   1,243.23x = 1,715.59 × 683.72
4. Step 4: Simplify right side
   1,243.23x = 1,172,981.90
5. Step 5: Solve for x
   x = 1,172,981.90/1,243.23
6. Step 6: Final answer
   x = 943.50