Finding the Fourth Proportional to 1,309.30, 1,806.81 and 719.82

Step by Step Solution

1. Step 1: Write the proportion equation
   1,309.30 : 1,806.81 = 719.82 : x
2. Step 2: Convert to fraction form
   1,309.30/1,806.81 = 719.82/x
3. Step 3: Cross multiply
   1,309.30x = 1,806.81 × 719.82
4. Step 4: Simplify right side
   1,309.30x = 1,300,575.27
5. Step 5: Solve for x
   x = 1,300,575.27/1,309.30
6. Step 6: Final answer
   x = 993.34