Finding the Fourth Proportional to 1,309.05, 1,806.46 and 719.57

Step by Step Solution

1. Step 1: Write the proportion equation
   1,309.05 : 1,806.46 = 719.57 : x
2. Step 2: Convert to fraction form
   1,309.05/1,806.46 = 719.57/x
3. Step 3: Cross multiply
   1,309.05x = 1,806.46 × 719.57
4. Step 4: Simplify right side
   1,309.05x = 1,299,875.32
5. Step 5: Solve for x
   x = 1,299,875.32/1,309.05
6. Step 6: Final answer
   x = 992.99