Finding the Fourth Proportional to 1,396.80, 1,927.78 and 799.48

Step by Step Solution

1. Step 1: Write the proportion equation
   1,396.80 : 1,927.78 = 799.48 : x
2. Step 2: Convert to fraction form
   1,396.80/1,927.78 = 799.48/x
3. Step 3: Cross multiply
   1,396.80x = 1,927.78 × 799.48
4. Step 4: Simplify right side
   1,396.80x = 1,541,221.55
5. Step 5: Solve for x
   x = 1,541,221.55/1,396.80
6. Step 6: Final answer
   x = 1,103.39