Finding the Fourth Proportional to 1,320.22, 1,978.71 and 799.39

Step by Step Solution

1. Step 1: Write the proportion equation
   1,320.22 : 1,978.71 = 799.39 : x
2. Step 2: Convert to fraction form
   1,320.22/1,978.71 = 799.39/x
3. Step 3: Cross multiply
   1,320.22x = 1,978.71 × 799.39
4. Step 4: Simplify right side
   1,320.22x = 1,581,760.99
5. Step 5: Solve for x
   x = 1,581,760.99/1,320.22
6. Step 6: Final answer
   x = 1,198.10