Finding the Fourth Proportional to 1,991.66, 2,748.56 and 1,107.50

Step by Step Solution

1. Step 1: Write the proportion equation
   1,991.66 : 2,748.56 = 1,107.50 : x
2. Step 2: Convert to fraction form
   1,991.66/2,748.56 = 1,107.50/x
3. Step 3: Cross multiply
   1,991.66x = 2,748.56 × 1,107.50
4. Step 4: Simplify right side
   1,991.66x = 3,044,030.20
5. Step 5: Solve for x
   x = 3,044,030.20/1,991.66
6. Step 6: Final answer
   x = 1,528.39