Finding the Fourth Proportional to 2,661.30, 3,991.28 and 1,100.03

Step by Step Solution

1. Step 1: Write the proportion equation
   2,661.30 : 3,991.28 = 1,100.03 : x
2. Step 2: Convert to fraction form
   2,661.30/3,991.28 = 1,100.03/x
3. Step 3: Cross multiply
   2,661.30x = 3,991.28 × 1,100.03
4. Step 4: Simplify right side
   2,661.30x = 4,390,502.28
5. Step 5: Solve for x
   x = 4,390,502.28/2,661.30
6. Step 6: Final answer
   x = 1,649.76