Finding the Fourth Proportional to 1,991.84, 2,749.42 and 1,205.88

Step by Step Solution

1. Step 1: Write the proportion equation
   1,991.84 : 2,749.42 = 1,205.88 : x
2. Step 2: Convert to fraction form
   1,991.84/2,749.42 = 1,205.88/x
3. Step 3: Cross multiply
   1,991.84x = 2,749.42 × 1,205.88
4. Step 4: Simplify right side
   1,991.84x = 3,315,477.89
5. Step 5: Solve for x
   x = 3,315,477.89/1,991.84
6. Step 6: Final answer
   x = 1,664.53