Finding the Fourth Proportional to 1,279.82, 1,766.06 and 720.26

Step by Step Solution

1. Step 1: Write the proportion equation
   1,279.82 : 1,766.06 = 720.26 : x
2. Step 2: Convert to fraction form
   1,279.82/1,766.06 = 720.26/x
3. Step 3: Cross multiply
   1,279.82x = 1,766.06 × 720.26
4. Step 4: Simplify right side
   1,279.82x = 1,272,022.38
5. Step 5: Solve for x
   x = 1,272,022.38/1,279.82
6. Step 6: Final answer
   x = 993.91