Finding the Fourth Proportional to 2,443.17, 3,665.21 and 799.80

Step by Step Solution

1. Step 1: Write the proportion equation
   2,443.17 : 3,665.21 = 799.80 : x
2. Step 2: Convert to fraction form
   2,443.17/3,665.21 = 799.80/x
3. Step 3: Cross multiply
   2,443.17x = 3,665.21 × 799.80
4. Step 4: Simplify right side
   2,443.17x = 2,931,430.96
5. Step 5: Solve for x
   x = 2,931,430.96/2,443.17
6. Step 6: Final answer
   x = 1,199.85