Finding the Fourth Proportional to 1,243.71, 1,715.79 and 712.50

Step by Step Solution

1. Step 1: Write the proportion equation
   1,243.71 : 1,715.79 = 712.50 : x
2. Step 2: Convert to fraction form
   1,243.71/1,715.79 = 712.50/x
3. Step 3: Cross multiply
   1,243.71x = 1,715.79 × 712.50
4. Step 4: Simplify right side
   1,243.71x = 1,222,500.38
5. Step 5: Solve for x
   x = 1,222,500.38/1,243.71
6. Step 6: Final answer
   x = 982.95