Finding the Fourth Proportional to 1,991.71, 2,748.32 and 1,107.39

Step by Step Solution

1. Step 1: Write the proportion equation
   1,991.71 : 2,748.32 = 1,107.39 : x
2. Step 2: Convert to fraction form
   1,991.71/2,748.32 = 1,107.39/x
3. Step 3: Cross multiply
   1,991.71x = 2,748.32 × 1,107.39
4. Step 4: Simplify right side
   1,991.71x = 3,043,456.55
5. Step 5: Solve for x
   x = 3,043,456.55/1,991.71
6. Step 6: Final answer
   x = 1,528.06