Finding the Fourth Proportional to 1,314.81, 1,814.47 and 717.31

Step by Step Solution

1. Step 1: Write the proportion equation
   1,314.81 : 1,814.47 = 717.31 : x
2. Step 2: Convert to fraction form
   1,314.81/1,814.47 = 717.31/x
3. Step 3: Cross multiply
   1,314.81x = 1,814.47 × 717.31
4. Step 4: Simplify right side
   1,314.81x = 1,301,548.10
5. Step 5: Solve for x
   x = 1,301,548.10/1,314.81
6. Step 6: Final answer
   x = 989.91