Finding the Fourth Proportional to 2,168.30, 2,991.12 and 1,329.20

Step by Step Solution

1. Step 1: Write the proportion equation
   2,168.30 : 2,991.12 = 1,329.20 : x
2. Step 2: Convert to fraction form
   2,168.30/2,991.12 = 1,329.20/x
3. Step 3: Cross multiply
   2,168.30x = 2,991.12 × 1,329.20
4. Step 4: Simplify right side
   2,168.30x = 3,975,781.75
5. Step 5: Solve for x
   x = 3,975,781.75/2,168.30
6. Step 6: Final answer
   x = 1,833.60