Finding the Fourth Proportional to 3,669.81, 5,064.31 and 1,991.18

Step by Step Solution

1. Step 1: Write the proportion equation
   3,669.81 : 5,064.31 = 1,991.18 : x
2. Step 2: Convert to fraction form
   3,669.81/5,064.31 = 1,991.18/x
3. Step 3: Cross multiply
   3,669.81x = 5,064.31 × 1,991.18
4. Step 4: Simplify right side
   3,669.81x = 10,083,952.79
5. Step 5: Solve for x
   x = 10,083,952.79/3,669.81
6. Step 6: Final answer
   x = 2,747.81