Finding the Fourth Proportional to 1,309.34, 1,806.71 and 719.86

Step by Step Solution

1. Step 1: Write the proportion equation
   1,309.34 : 1,806.71 = 719.86 : x
2. Step 2: Convert to fraction form
   1,309.34/1,806.71 = 719.86/x
3. Step 3: Cross multiply
   1,309.34x = 1,806.71 × 719.86
4. Step 4: Simplify right side
   1,309.34x = 1,300,578.26
5. Step 5: Solve for x
   x = 1,300,578.26/1,309.34
6. Step 6: Final answer
   x = 993.31