Finding the Fourth Proportional to 1,991.61, 2,748.18 and 1,107.27

Step by Step Solution

1. Step 1: Write the proportion equation
   1,991.61 : 2,748.18 = 1,107.27 : x
2. Step 2: Convert to fraction form
   1,991.61/2,748.18 = 1,107.27/x
3. Step 3: Cross multiply
   1,991.61x = 2,748.18 × 1,107.27
4. Step 4: Simplify right side
   1,991.61x = 3,042,977.27
5. Step 5: Solve for x
   x = 3,042,977.27/1,991.61
6. Step 6: Final answer
   x = 1,527.90