Finding the Fourth Proportional to 1,100.81, 1,649.67 and 791.21

Step by Step Solution

1. Step 1: Write the proportion equation
   1,100.81 : 1,649.67 = 791.21 : x
2. Step 2: Convert to fraction form
   1,100.81/1,649.67 = 791.21/x
3. Step 3: Cross multiply
   1,100.81x = 1,649.67 × 791.21
4. Step 4: Simplify right side
   1,100.81x = 1,305,234.82
5. Step 5: Solve for x
   x = 1,305,234.82/1,100.81
6. Step 6: Final answer
   x = 1,185.71