Finding the Fourth Proportional to 1,991.75, 2,748.67 and 1,205.34

Step by Step Solution

1. Step 1: Write the proportion equation
   1,991.75 : 2,748.67 = 1,205.34 : x
2. Step 2: Convert to fraction form
   1,991.75/2,748.67 = 1,205.34/x
3. Step 3: Cross multiply
   1,991.75x = 2,748.67 × 1,205.34
4. Step 4: Simplify right side
   1,991.75x = 3,313,081.90
5. Step 5: Solve for x
   x = 3,313,081.90/1,991.75
6. Step 6: Final answer
   x = 1,663.40