Finding the Fourth Proportional to 1,991.82, 2,748.60 and 1,107.57

Step by Step Solution

1. Step 1: Write the proportion equation
   1,991.82 : 2,748.60 = 1,107.57 : x
2. Step 2: Convert to fraction form
   1,991.82/2,748.60 = 1,107.57/x
3. Step 3: Cross multiply
   1,991.82x = 2,748.60 × 1,107.57
4. Step 4: Simplify right side
   1,991.82x = 3,044,266.90
5. Step 5: Solve for x
   x = 3,044,266.90/1,991.82
6. Step 6: Final answer
   x = 1,528.38