Finding the Fourth Proportional to 2,165.20, 2,987.82 and 1,208.04

Step by Step Solution

1. Step 1: Write the proportion equation
   2,165.20 : 2,987.82 = 1,208.04 : x
2. Step 2: Convert to fraction form
   2,165.20/2,987.82 = 1,208.04/x
3. Step 3: Cross multiply
   2,165.20x = 2,987.82 × 1,208.04
4. Step 4: Simplify right side
   2,165.20x = 3,609,406.07
5. Step 5: Solve for x
   x = 3,609,406.07/2,165.20
6. Step 6: Final answer
   x = 1,667.01