Finding the Fourth Proportional to 1,991.89, 2,748.69 and 1,107.67

Step by Step Solution

1. Step 1: Write the proportion equation
   1,991.89 : 2,748.69 = 1,107.67 : x
2. Step 2: Convert to fraction form
   1,991.89/2,748.69 = 1,107.67/x
3. Step 3: Cross multiply
   1,991.89x = 2,748.69 × 1,107.67
4. Step 4: Simplify right side
   1,991.89x = 3,044,641.45
5. Step 5: Solve for x
   x = 3,044,641.45/1,991.89
6. Step 6: Final answer
   x = 1,528.52