Finding the Fourth Proportional to 1,319.47, 1,978.18 and 799.34

Step by Step Solution

1. Step 1: Write the proportion equation
   1,319.47 : 1,978.18 = 799.34 : x
2. Step 2: Convert to fraction form
   1,319.47/1,978.18 = 799.34/x
3. Step 3: Cross multiply
   1,319.47x = 1,978.18 × 799.34
4. Step 4: Simplify right side
   1,319.47x = 1,581,238.40
5. Step 5: Solve for x
   x = 1,581,238.40/1,319.47
6. Step 6: Final answer
   x = 1,198.39