Finding the Fourth Proportional to 1,308.56, 1,805.78 and 719.09

Step by Step Solution

1. Step 1: Write the proportion equation
   1,308.56 : 1,805.78 = 719.09 : x
2. Step 2: Convert to fraction form
   1,308.56/1,805.78 = 719.09/x
3. Step 3: Cross multiply
   1,308.56x = 1,805.78 × 719.09
4. Step 4: Simplify right side
   1,308.56x = 1,298,505.72
5. Step 5: Solve for x
   x = 1,298,505.72/1,308.56
6. Step 6: Final answer
   x = 992.32