Finding the Fourth Proportional to 1,308.99, 1,958.67 and 789.30

Step by Step Solution

1. Step 1: Write the proportion equation
   1,308.99 : 1,958.67 = 789.30 : x
2. Step 2: Convert to fraction form
   1,308.99/1,958.67 = 789.30/x
3. Step 3: Cross multiply
   1,308.99x = 1,958.67 × 789.30
4. Step 4: Simplify right side
   1,308.99x = 1,545,978.23
5. Step 5: Solve for x
   x = 1,545,978.23/1,308.99
6. Step 6: Final answer
   x = 1,181.05