Finding the Fourth Proportional to 1,314.38, 1,813.81 and 716.89

Step by Step Solution

1. Step 1: Write the proportion equation
   1,314.38 : 1,813.81 = 716.89 : x
2. Step 2: Convert to fraction form
   1,314.38/1,813.81 = 716.89/x
3. Step 3: Cross multiply
   1,314.38x = 1,813.81 × 716.89
4. Step 4: Simplify right side
   1,314.38x = 1,300,294.97
5. Step 5: Solve for x
   x = 1,300,294.97/1,314.38
6. Step 6: Final answer
   x = 989.28