Finding the Fourth Proportional to 2,454.72, 3,682.68 and 811.20

Step by Step Solution

1. Step 1: Write the proportion equation
   2,454.72 : 3,682.68 = 811.20 : x
2. Step 2: Convert to fraction form
   2,454.72/3,682.68 = 811.20/x
3. Step 3: Cross multiply
   2,454.72x = 3,682.68 × 811.20
4. Step 4: Simplify right side
   2,454.72x = 2,987,390.02
5. Step 5: Solve for x
   x = 2,987,390.02/2,454.72
6. Step 6: Final answer
   x = 1,217.00