Finding the Fourth Proportional to 1,991.59, 2,747.96 and 1,205.62

Step by Step Solution

1. Step 1: Write the proportion equation
   1,991.59 : 2,747.96 = 1,205.62 : x
2. Step 2: Convert to fraction form
   1,991.59/2,747.96 = 1,205.62/x
3. Step 3: Cross multiply
   1,991.59x = 2,747.96 × 1,205.62
4. Step 4: Simplify right side
   1,991.59x = 3,312,995.54
5. Step 5: Solve for x
   x = 3,312,995.54/1,991.59
6. Step 6: Final answer
   x = 1,663.49