Finding the Fourth Proportional to 1,308.24, 1,805.35 and 718.76

Step by Step Solution

1. Step 1: Write the proportion equation
   1,308.24 : 1,805.35 = 718.76 : x
2. Step 2: Convert to fraction form
   1,308.24/1,805.35 = 718.76/x
3. Step 3: Cross multiply
   1,308.24x = 1,805.35 × 718.76
4. Step 4: Simplify right side
   1,308.24x = 1,297,613.37
5. Step 5: Solve for x
   x = 1,297,613.37/1,308.24
6. Step 6: Final answer
   x = 991.88