Finding the Fourth Proportional to 1,309.32, 1,806.89 and 719.87

Step by Step Solution

1. Step 1: Write the proportion equation
   1,309.32 : 1,806.89 = 719.87 : x
2. Step 2: Convert to fraction form
   1,309.32/1,806.89 = 719.87/x
3. Step 3: Cross multiply
   1,309.32x = 1,806.89 × 719.87
4. Step 4: Simplify right side
   1,309.32x = 1,300,713.27
5. Step 5: Solve for x
   x = 1,300,713.27/1,309.32
6. Step 6: Final answer
   x = 993.43