Finding the Fourth Proportional to 1,991.69, 2,747.71 and 1,361.20

Step by Step Solution

1. Step 1: Write the proportion equation
   1,991.69 : 2,747.71 = 1,361.20 : x
2. Step 2: Convert to fraction form
   1,991.69/2,747.71 = 1,361.20/x
3. Step 3: Cross multiply
   1,991.69x = 2,747.71 × 1,361.20
4. Step 4: Simplify right side
   1,991.69x = 3,740,182.85
5. Step 5: Solve for x
   x = 3,740,182.85/1,991.69
6. Step 6: Final answer
   x = 1,877.89