Finding the Fourth Proportional to 1,308.31, 1,805.38 and 718.83

Step by Step Solution

1. Step 1: Write the proportion equation
   1,308.31 : 1,805.38 = 718.83 : x
2. Step 2: Convert to fraction form
   1,308.31/1,805.38 = 718.83/x
3. Step 3: Cross multiply
   1,308.31x = 1,805.38 × 718.83
4. Step 4: Simplify right side
   1,308.31x = 1,297,759.51
5. Step 5: Solve for x
   x = 1,297,759.51/1,308.31
6. Step 6: Final answer
   x = 991.94