Finding the Fourth Proportional to 2,649.42, 3,974.15 and 800.55

Step by Step Solution

1. Step 1: Write the proportion equation
   2,649.42 : 3,974.15 = 800.55 : x
2. Step 2: Convert to fraction form
   2,649.42/3,974.15 = 800.55/x
3. Step 3: Cross multiply
   2,649.42x = 3,974.15 × 800.55
4. Step 4: Simplify right side
   2,649.42x = 3,181,485.91
5. Step 5: Solve for x
   x = 3,181,485.91/2,649.42
6. Step 6: Final answer
   x = 1,200.83