Finding the Fourth Proportional to 1,308.91, 1,806.31 and 719.46

Step by Step Solution

1. Step 1: Write the proportion equation
   1,308.91 : 1,806.31 = 719.46 : x
2. Step 2: Convert to fraction form
   1,308.91/1,806.31 = 719.46/x
3. Step 3: Cross multiply
   1,308.91x = 1,806.31 × 719.46
4. Step 4: Simplify right side
   1,308.91x = 1,299,567.79
5. Step 5: Solve for x
   x = 1,299,567.79/1,308.91
6. Step 6: Final answer
   x = 992.86