Finding the Fourth Proportional to 1,308.89, 1,806.30 and 719.48

Step by Step Solution

1. Step 1: Write the proportion equation
   1,308.89 : 1,806.30 = 719.48 : x
2. Step 2: Convert to fraction form
   1,308.89/1,806.30 = 719.48/x
3. Step 3: Cross multiply
   1,308.89x = 1,806.30 × 719.48
4. Step 4: Simplify right side
   1,308.89x = 1,299,601.24
5. Step 5: Solve for x
   x = 1,299,601.24/1,308.89
6. Step 6: Final answer
   x = 992.90