Finding the Fourth Proportional to 1,309.17, 1,806.73 and 719.83

Step by Step Solution

1. Step 1: Write the proportion equation
   1,309.17 : 1,806.73 = 719.83 : x
2. Step 2: Convert to fraction form
   1,309.17/1,806.73 = 719.83/x
3. Step 3: Cross multiply
   1,309.17x = 1,806.73 × 719.83
4. Step 4: Simplify right side
   1,309.17x = 1,300,532.14
5. Step 5: Solve for x
   x = 1,300,532.14/1,309.17
6. Step 6: Final answer
   x = 993.40