Finding the Fourth Proportional to 1,308.72, 1,806.08 and 719.30

Step by Step Solution

1. Step 1: Write the proportion equation
   1,308.72 : 1,806.08 = 719.30 : x
2. Step 2: Convert to fraction form
   1,308.72/1,806.08 = 719.30/x
3. Step 3: Cross multiply
   1,308.72x = 1,806.08 × 719.30
4. Step 4: Simplify right side
   1,308.72x = 1,299,100.72
5. Step 5: Solve for x
   x = 1,299,100.72/1,308.72
6. Step 6: Final answer
   x = 992.65