Finding the Fourth Proportional to 1,309.25, 1,806.77 and 719.79

Step by Step Solution

1. Step 1: Write the proportion equation
   1,309.25 : 1,806.77 = 719.79 : x
2. Step 2: Convert to fraction form
   1,309.25/1,806.77 = 719.79/x
3. Step 3: Cross multiply
   1,309.25x = 1,806.77 × 719.79
4. Step 4: Simplify right side
   1,309.25x = 1,300,494.98
5. Step 5: Solve for x
   x = 1,300,494.98/1,309.25
6. Step 6: Final answer
   x = 993.31