Finding the Fourth Proportional to 1,991.28, 2,747.98 and 1,107.12

Step by Step Solution

1. Step 1: Write the proportion equation
   1,991.28 : 2,747.98 = 1,107.12 : x
2. Step 2: Convert to fraction form
   1,991.28/2,747.98 = 1,107.12/x
3. Step 3: Cross multiply
   1,991.28x = 2,747.98 × 1,107.12
4. Step 4: Simplify right side
   1,991.28x = 3,042,333.62
5. Step 5: Solve for x
   x = 3,042,333.62/1,991.28
6. Step 6: Final answer
   x = 1,527.83